Why Does Light Exist? What is Its Purpose?

[@ArvinAsh]

Guys, I'm really excited about our sponsor for this video. The products I receive are superb! Check them out, and you will be helping our channel if you decide to subscribe. Many thanks for that! Head to www.bespokepost.com/arvinash20 and use code ARVINASH20 to grab your “box of awesome” and get 20% off your first box.

[@shethtejas104]

Arvin, marvellous effort this. I must compliment you for the choice of visuals in particular. It must take huge efforts to compile all the visuals and also a lot of creative thinking. Kudos to your hard work. May I make some requests for the next video of yours? Please allow me. (1) Northern lights. I saw them recently. I am still in complete awe of its beauty. Yes, there is google. But google is not Arvin! And the way the two explain things is totally different. (2) Shannon's paper on information theory. I am a telecom engineer, I write microprocessor code for global telecom chip makers. I know that Shannon's equation C=B(log-base-2-of-SNR + 1) has done to the world of telephony, what Einstein did to classical and quantum mechanics. But Shannon, my hero, has not got the kind of limelight he deserves. Could you spell out Shannon's work for the masses please? I will make more requests in future. Thank you once again!

[@sirdiealot53]

Thank you for correctly pronouncing “processes”! Sooo many videos say it like “process-EEZ” which is wrong and sounds pretentious.

[@famgod8318]

I know this sponsorship is mainly aimed at your US audience but as a Brit I couldn’t help but chuckle when they were described as ‘top shelf’ Clearly has a very different meaning across the pond.

[@ujjwalverma468]

Thank you

[@81giorikas]

Einstein died admiting he doesn't really know what photons are and youtube is full of videos claiming to do so. Well.

[@TheSaferHouse]

A photon walks into a hotel. The bellhop says, "Excuse me sir, may I take your luggage?" The photon replies, "No thanks, I'm traveling light."

[@mikeoglen6848]

I think you are stretching things a bit to imagine that Photons can actually talk...

[@perrynn7173]

@@mikeoglen6848 It's just a joke. Goodness me.

[@EinsteinKnowedIt]

Holy magic schoolbus 😮

[@nevamind68t23]

Ka-boom-boom 😂 👍🏾 🤎

[@Archiveofobscurity]

Loooooool 😹

[@ViciousViscount]

What's truly mind blowing about light is that a photon, due to relativistic effects (time dilation, length contraction) does not experience time nor space. From a photon's point of view the universe is just a single point, and everything happens all at once. It basically exists in a timeless spaceless form. Which is so crazy.

[@TMoneyMil]

Which means it could’ve existed BEFORE the universe was created. I think we are missing information about exactly what light is.

[@nikhat6884]

​@@TMoneyMil no it's just really simple, no need to make it complicated.

[@DrDeuteron]

there are no reference frames at the speed of light, so saying light doesn't experience time can be misleading.

[@stylusapteryx1490]

@@DrDeuteronOr is it that light IS the reference frame, the universal constant? From outside, light can be observed travelling through space and time. But through relativity (being relative to the constant reference frame of light), space and time are contracted as you approach light speed, until at the speed of light distance and time are both zero. So light does not experience either time or distance.

[@hyperduality2838]

SINE is dual to COSINE -- waves are dual, the word 'co' means mutual and implies duality. Bosons (waves) are dual to Fermions (particles) -- wave/particle or quantum duality. Time dilation is dual to length contraction -- Einstein, special relativity. At the velocity of light there is no distance or space! "Always two there are" -- Yoda.

[@markmark63]

The behaviour of photons that blows my mind - given that they are packets of energy is that after radiating out in all directions from a distant star - for example V762 Cas in Cassiopeia, photons constantly arrive at my retina then stop. But if I then move 5mm to my left, right, forward, back, or move a mile or 1,000 miles I can still see it. It blows my mind that photons are still radiating to every microscopic point in the visible universe from 1,000's of light years away.

[@resq5707]

Relative to each other each of us is at the centre of the universe, 13.8 billion light years pivoting on our heads 😮

[@raptorsean1464]

Light is evaporation, and matter is condensation. Also, when light is stretched well beyond redshift and radio waves, it becomes dark energy. Like water, turning to steam.

[@_xBrokenxDreamsx_]

photons don't exist.. the activity of the medium creates the illusion of particles and waves. light is the electromagnetic atmosphere and illumination is the interplay of that atmosphere with itself. as tesla said light is a soundwave.. which is only partially correct because sound is just a vibration of the gaseous atmosphere at a frequency that we can sense. with illumination the cosmic pressures are changing at a particular wavelength and frequency also. the universe is unified.

[@jerrypolverino6025]

@@raptorsean1464No evidence of that.

[@perumalsrinivasan23]

​@@raptorsean1464 interesting hypothesis

[@NathanRichHotpot]

5:46 (photons' energies go from gamma to light spectrum while bouncing around in the sun). Can you explain or point to a video explaining where this energy goes? Thanks.

[@schmetterling4477]

That is stretching it a bit. The internal temperature of the sun is approx. 15 million K, roughly 3000 hotter than the surface. That pushes the black body spectrum peak from approx. 2eV (green) to maybe 6keV. I would call that "very mild x-ray energies", at most. The energy is transported by radiation from the core to roughly 75% of the solar radius, I believe, and then convection takes over as the main transport mechanism. The main difference is time constant. Radiative transport if very slow and takes a hundred thousand years, or so, while the convection zone churns this energy inside out in weeks, it seems.

[@e.mcguire1538]

Thanks so much, Arvin. Your programs are lucid and exciting. I wish videos like this had been available way back when I was in high school and college.

[@ArvinAsh]

You're very welcome! I wish that too, that's why I decided to create them.

[@alcyone1349]

It seems that we all take light for granted a little too much. Wow! Thanks Arvin!

[@hyperduality2838]

SINE is dual to COSINE -- waves are dual, the word 'co' means mutual and implies duality. Bosons (waves) are dual to Fermions (particles) -- wave/particle or quantum duality. Time dilation is dual to length contraction -- Einstein, special relativity. At the velocity of light there is no distance or space! "Always two there are" -- Yoda.

[@edinfific2576]

​​​@@hyperduality2838 If there is no distance or space for light, then it should get anywhere in no time. 😁

[@hyperduality2838]

@@edinfific2576 Spooky action at a distance -- Einstein. Light does not experience time as space is contracted to zero in the direction of motion. Space is dual to time -- Einstein. Null vectors (light rays) are dual to spinors (matter). Spinors come in pairs -- Weyl spinors. Duality (thesis, anti-thesis) creates or synthesizes reality (non duality) -- the time independent Hegelian dialectic. Making predictions to track targets, goals & objectives is a syntropic process -- teleological. Teleological physics (syntropy) is dual to non teleological physics (entropy). "Always two there are" -- Yoda.

[@TheTck90]

@@hyperduality2838 There is so much wrong with your babbling that I don't know where to start from...

[@onlythewise1]

@@hyperduality2838 ya been known for fifty years

[@ronjon7942]

I know I studied Maxwell in college, but it was beyond my comprehension. I still don't intuit it, but Arvin's mention at 4:15 of the permitivity and permissiveness of free space, and how those properties 'limit' the speed of light, FINALLY shed some realization on Einstein's thought experiment of the speed of light in a train equaling the speed of light on the ground. Of course there's still more I don't know than do (and for now, I don't have to worry about that), but now actually believing the speed of light is the same from every reference point opens up a lot of lay explanations and theories to me. I always got hung up on the speed of light thing so I could never really digest relativity, time paradox, black holes, time dilation and so on, so it will be exciting revisiting these topics with a different perspective. Granted, I'm basically switching from Einstein 'saying so' to Maxwell, but it's a start. It's not like I 'know' why electricity flows in a certain direction either, or how some matter vibrates at unbelievable frequencies, but I can accept the phenomenon; now I feel like I can accept that light travels at a particular speed, a pretty big deal. Too bad it's over 30 years late!! :) Thank you very much, Mr. Ash! Know that you helped this guy understand just a little bit more today.

[@jimbuskist3190]

Red shift then proves the speed of the light source travelling does add energy to the light frequency observed so that energy of the source speed is not lost.

[@Dogsnark]

I’ve never heard light explained this way. I don’t fully understand this explanation, so I need to watch it again. But what a fascinating video.

[@LazyRare]

Good luck

[@zodoturtle]

I will give you a boost. It feels to me that he is playing fast and loose with the definition of light. In is explanation and examples he is referring to all of the electromagnetic spectrum as light. This includes all radio waves including but not limited to AM/FM, TV Stations, WiFi, cell phone signals, Bluetooth, wireless charging and microwaves from ovens power. It also includes heat from a stove or bed warmer (Infrared).

[@TheAncientAstronomer]

​@@zodoturtleAnd yet he is correct. Everything is light. And not just the tiny part,of the EM spectrum, we can see.

[@garycross90]

Thank you Arvin. I was struggling to understand the application of electromagnetism until the moment you used friction as an example. I get it now and can now see all the applications for it everywhere. It's alive! And our life.

[@coreywright6192]

I've come to count on your content in these recent months or so. And you delivered again (to no surprise) as you do in most of your videos... I'm very grateful to you for taking the time and resources it requires for you to meet your mark where you can not only shine brightly yourself but, share that illuminosity/ energy with those of us with restless and curious minds

[@shethtejas104]

Arvin, a great video once again. Please continue the good work and spreading the 'light' of knowledge :)

[@aprisonerscinemastephenmur6932]

You are brilliant mate! So many times i stumble across a new video at the right time and it just perfectly pieces together a deeper more intuitive grasp of different fields in physics and the natural of reality in general. Thank you!

[@wesbaumguardner8829]

No, he is just good at duping people into believing nonsense.

[@alfadog67]

"Light is the fundamental currency used to exchange energy and information" - Professor Arvin Ash 🏅 Thank you for defining such a philosophical topic so literally! Professor Ash, I would appreciate your insight and lens regarding the animations of photons and electrons at 6:22 , but as quantum objects instead of classical ones.

[@Nudnik1]

Fiber optic internet telecom also . Banks use for transmission of currency 💲💵

[@Chizzoide]

@@Nudnik1 money is a very specific currency for a very specific species at a very specific moment in time and place in the universe. While light is a universal currency.

[@Nudnik1]

@@Chizzoide electro magnetic money 🤑

[@Chizzoide]

@@Nudnik1now I'm thinking of funnier things, like electromagnetic farts

[@ShomeAvi]

Light is God

[@GolDGreg]

This is the most mind blowing physics video I’ve ever seen and I’ve been watching them for years. You explained things that have never been explained to me before.

[@misslayer999]

I'm a first-year neuroscience student, currently taking general chemistry. I'm learning about all of these topics individually, wavelength, frequency, orbitals, electronegativity, etc. This was a great overview of a lot of that stuff. I'm pretty familiar with the visual transduction cascade already( which I find absolutely fascinating) so this was a great reminder of how all of these things are connected. For me that's really helpful to stay interested and motivated to get through these prereqs, so thank you!

[@Hossak]

This is the way light should be introduced at school. Great video Arvin!!!!

[@MhmdMhmdy-d2j]

Very cool videos Arvin! Thank you so much for the great and beautifully put explanation on almost every difficult science matter that you do a video on🎉

[@JdSpoof]

This gives a whole new meaning to “Let there be light.”

[@michaelfrankel8082]

How so?

[@chimmy___]

God knows how to make a universe.

[@AB-et6nj]

@@chimmy___ "When God began to create heaven and earth---the earth being unformed and void, with darkness over the surface of the deep and a wind from God sweeping over the water---God said, 'Let there be light' and there was Light." Hmmm, what's this "surface of the deep" preceding the creation of heaven, earth, and light? Funny how that part is always skipped by Christians when they talk about how "let there be light" is the big bang

[@chimmy___]

@@AB-et6nj The short answer is that the way I understand Genesis 1:3 is that it is referring to the creation, not of the universe (and therefore the big bang), but to the creation of the solar system. According to physicists, the way a solar system forms, a massive interstellar nebula condenses through gravity. The slight angular momentum produces a significant amount of spinning as the gas cloud condenses and heats. As the material collapses toward the center, the material which remains farther from the center produces smaller condensations we call planets. The material at the center eventually becomes so dense and hot that fusion begins. At that time, light is produced. Later, the planets which form cool to the point that they have a solid surface. In the case of the earth, the ocean formed, as well as an atmosphere. Eventually, folding and other motion of the crust produced continents which rose above the oceans. I believe this is in very good agreement with the description in the first several verses of Genesis chapter one.

[@AB-et6nj]

@@chimmy___ I don't know why I bother, but it's a real stretch to say this is an account of the origin of our solar system. Not only could it have been worded much differently, but that description doesn't cover interstellar nebula and gas clouds at all. It doesn't say gas clouds, it says "the surface of the deep." And note the order of things: primordial waters preceded light itself. You know a much easier explanation for this is that Genesis borrowed from other ancient Near Eastern myths, such as the Enūma Eliš, which conspicuously had similar openings, and which also espoused the view of primordial waters preceding creation.

[@BrentSaulic]

Thanks!

[@ArvinAsh]

Many thanks!

[@relativeparadox9567]

The idea that the 'why' for anything in the universe is for us to know or that we would even be advanced enough to comprehend it is a prime example of human hubris.

[@ronjon7942]

Then you're fortunate that people who made KZbin and the tablet you're using respectfully disagree, at least to the extent possible.

[@relativeparadox9567]

@@ronjon7942 just cause you can use things in the universe and manipulate them in a way that we can put them to use for millions of application does not answer the questions 'what is the universe and why is it there and what actually is anything that it contains' for all it's impressive results, science cannot touch these questions.

[@YISTECH]

@@relativeparadox9567 my thoughts too, as well. Some things, just cannot be explained, and will, never ever be explained.

[@enekaitzteixeira7010]

​@@ronjon7942 The people who made YT never thought about that, much less the lowlifes that are running it now

[@rileighchristine_]

Exactly

[@Shaaan]

Last time I was here you were on 90k, infact I was from start where you had 6k subs. You deserve it all.

[@ChilledParadox]

I believe physics channels grow slower as those interested are niche, and that niche group is very wary of pseudo-information channels, especially since the dislike button was removed. But once people establish that a channel is legitimate and the numbers pick up they grow exponentially as it’s like a giant glowing sign.

[@Dxeus]

I haven't watched the video yet, but I am impatient to ask a few questions. When a photon hit an object and bounces, does it store the information about the surface on which it got bounced? Where and how does the photon store that information? Can I say, that any large object e.g., a tennis ball bouncing off of a surface will have information stored about the surface and I will need a machine/system to read that information from that ball? I mean to say, are the laws of transmitting information are same for larger objects like a tennis ball?

[@ArvinAsh]

Light undergoes processes prior to hitting your eyes. Its amplitude, polarisation, frequency, pulse time get affected. These processes carry information about the object that it is being reflected from. For example, when you see a yellow tennis ball, it means that yellow light was being reflected back, but other wavelengths of light were absorbed. You also view it as spherical. The light waves hitting your eyes create shadows and depth. All these aspects carry information about the object.

[@RobertSeacordC]

@@ArvinAsh so the answer is "no" then, because the actual photon is unchanged.

[@onlyeyeno]

@@RobertSeacordC That was not how I understood/interpreted his reply. To me it was neither a "straight" Yes or No, but rather as is so often the case it was "it depends". As far as I understand it a photon doesn't have any "embedded information" apart from it's "own basic attributes" such as frequency , amplitude, polarisation, direction... And these "attributes" really doesn't carry any information regarding anything "external to it" etc.... So that would make the "answer" NO. But that is only if You don't have any "information" about the context of that photon (or rather it's causal predecessor), such as for instance You know something about that phonton's "attributes" prior in (Your) time. Because if You do, then the photon ""carries information" about the fact that "something has happened", something has made "that photon change" from "it's previous state" to it's "current state".... To me the question regarding "what is carrying information" is a very "tricky one" and not easy to answer without very clear definitions and context,. To make a (possibly overly simplified but still) analogy to "patterns". (As far as I understand) Information is in essence "patterns". How ever patterns can't often (never?) be "discerned" by looking on single "piece" of the pattern. When looked at "in isolation" that "piece" seemingly holds no particular (pun not intended) information. How ever when looking at that "piece" in it's "context" (as a part of the pattern) then "all of a sudden" You realise that the "piece" actually is a vital part of and carries information about that "pattern"... Apologies for the "rant", but at least that's my 5C's regarding this (i.m.h.o.) very interesting but complex question. Best regards.

[@Chizzoide]

@@onlyeyeno I read you and seems like a reasonable answer, and I have to suggest you control your use of parentheses and quotes, makes the reading difficult and confusing(diverts attention). Good answer tho

[@DrDeuteron]

@@onlyeyeno photons don't have a frequency and amplitude, since you need a reference frame to have to those. A photon on its own has a polarization.

[@mikel5582]

I appreciate that you added some conditions to your use of the word "purpose" but I wish you'd have been clearer that the "light" you're referring to includes the full EM spectrum and not the more common usage that's limited only to visible light.

[@HakimJamil94]

Interestingly, his usage of Light to include the full EM spectrum is sound with the Arabic word "Nūr" and also the Bahasa Melayu/Brunei/Indo word "Cahaya" which comes from the Sanskrit word "Chāyā́" (Lustre, Reflection, Shade, Shadow), a doublet of "Chā̃v" and "Sāyā". The universe is just Nūr (Light) filtered by Turāb (Dust).

[@christianfaust5141]

Danke!

[@ArvinAsh]

Thank you so much!

[@dukeon]

Great explanation of light (and electromagnetic radiation in general). I’m always on the lookout for good physics videos to point my friends - who are interested in physical science but don’t have university level education - and lately I’ve been recommending many of your videos. Thank you!

[@stefaniasmanio5857]

OMG... this is amazing.. content, explanation, sequence.. really the best synthesis ever... thank you so much!

[@TM-yn4iu]

This video was magical - both in fact and "speculation". Light is the memsmorizing flicker we see in the night sky, it allows us to move about in the dark and moreover creates hope and guides us in dark moments. The latter may not be of the same principle, but I will end believing it is - in hope and light. Thank you again, great video sharing science in a way that informs and enlightens.

[@drrayman1435]

“Let there be light!” And everything started! 😊

[@amakaoguejiofo6307]

Simple

[@makethisgowhoosh]

"And the light shineth in darkness, and the darkness did not comprehend it."

[@drrayman1435]

@@makethisgowhoosh Amen!

[@giuseppelogiurato5718]

Finally! Someone who talks like a regular person; I can actually listen to this! So sick of all these science channels with weird and/or foreign narrators.

[@exo-580]

yea Arvin ash content is easier to digest

[@almabracete394]

Magnificently done! The best explanation about what light is on KZbin!!!

[@ColbyNye]

This was a great topic! I've always wondered a photons purpose! I'd love to see a video on Purpose and Function of other Standard Model elementary particles like muon, tau particles. Thanks!

[@Nightscape_]

This video was very illuminating!

[@zeropain9319]

lol

[@nHans]

As others have pointed out: If the Electromagnetic Force did not exist, the Weak Force wouldn't exist either-it's both or none. Taking this argument further: If Grand Unification is real, then the Strong Force wouldn't exist either. And if one or more ToEs-for example, String Theory-are real, then even gravity cannot exist. So we have no idea what kind of an alternative universe we're talking about.

[@Govstuff137]

Hello. Dear Mr. Ash. Question. Is there a formula or explanation to explain why is it that our eyes, while being bombarded by reflected visible light from infinite directions all around us at all times. How is it we can see anything at all with all this energy scattering off every surface? 2. Light waves create interference patterns why is all this light energy not interfering with itself? Signed Durt.

[@ArvinAsh]

That's because light carries information, so when your eyes receive light from different sources, you see different information for its source, like direction, color, brightness etc. This is why you can see different things and not just light a blog of light.

[@ronjon7942]

It's fascinating to realize there is no color 'red,' for instance. It's only our brains that have evolved to see the color. If aliens exist, they may see red's particular frequency as something altogether different. Maybe they don't even see! That frequency might manifest in their brains as a buzzing sound or maybe a sensation of feel.

[@ankiabiom]

- The purpose of light is to be the currency with which the universe transfers energy and information from one place to another - This video is absolutelly beautiful!

[@iamstillthinking]

Anytime I want to learn something amazing about our universe, I can always count on this channel. Just incredible visuals and explanations, makes it so easy to intuit everything.

[@RickClark58]

You said something extremely profound which I think most people don't really grasp. You mentioned that what we see of the world around us is from light bouncing off an object and hitting our retinas and producing an electrical signal in our brain. What this means is that we do not have any direct connection to the universe around us. Everything we know of the universe is from electrical signals in our brain. What we think of as reality is actually the brain interpreting the signals we receive through our senses and creating a reality based on those signals. The universe we see around us is actually a continuous hallucination that our brain creates based on the input of our senses.

[@audiodead7302]

Simulation is a better word than hallucination.

[@alfadog67]

Another profound cookie roaster is that light doesn't really bounce off an object. Instead, the light waves are absorbed, and then new light waves are emitted. Stuff that we see is little all light-powered light machines.

[@ArvinAsh]

Correct. We have our other senses that back up what we see, so the universe certainly appears to be real. But again, the other senses are also picking up electromagnetic signals which our brain is interpreting. So yes, this is potentially a profound existential dilemma!

[@RickClark58]

@@audiodead7302 I am not sure about that. A hallucination occurs in the mind. A simulation occurs in a computer. I used hallucination because that is the term that is commonly used in this sort of discussion about the mind.

[@RickClark58]

@@ArvinAsh I have no doubt the universe is real, but is it really what we think it is? And can we ever really know the true nature of the universe? That is what I wonder.

[@osaobomhenefoghe8967]

I like seeing the physical universe through the equations... mind blowing!

[@RogerMillerInVA]

This is the simplest, clearest explanation of these phenomena - and in fact, of relativity and quantum theory generally - that I have ever heard. Thank you!

[@ArvinAsh]

Glad it was helpful!

[@RobertoCerv90]

I have question. The máss like a electron it's .511Mev. But that it's the energy or mass who need to pass tru higgs field. But that means That's the only energy on a particle or can be more without need a momentum. Or if electron and positron kills the energy its only 2(.511Mev)

[@suecondon1685]

I'm obsessed with light, I'm convinced it's the most mysterious, eerie thing in the Universe.

[@Kyle-nm1kh]

I'm not particularly religious but in Genesis that was the first thing God created. Perhaps understanding light is the key to understanding the rest?

[@hermes_logios]

It's only taken 100 years for us to admit that aether exists. We just had to come up with another name for it. Today, it's "virtual photons that mediate all interactions."

[@annoyingbstard9407]

My thoughts too. Huge efforts are now being made to think up new words for aether to avoid admitting a hundred years of scorn was possibly misplaced.

[@TheThinkersBible]

Very good observation and well said, and fancier, more modern concepts like space-time and dark matter are effectively more detailed examples of aether. That’s a pretty cool way to look at it!

[@benjamindover4337]

I once heard a theory that matter actually is light that has "stopped moving".

[@ArvinAsh]

That's an interesting way to look at it. I state in the video that if it were possible to convert 100% of an object's mass to energy (this is not possible), it would all be in the form of photons. And if you had enough energetic photons, you could theoretically convert it to mass.

[@Existidor.Serial137]

that is very intriguing and poetic at the same time

[@MxGrr]

@arvin Couldn’t we consider space-time a type of medium? In the way that “ether” was thought to be?

[@cliveburks]

Thanks Arvin very informative actually fascinating will see if you have a video explaining what gravity is. Keep up the brilliantly clear and mind expanding videos.

[@ArvinAsh]

Thanks for the compliment. Here is video on gravity that you might be looking for: kzbin.info/www/bejne/qqu0dGarjrFpbbc

[@nHans]

Sometimes it's just pointless reading what other people think. More than half the comments here are the exact same quote from a religious book. Which is, of course, to be expected on the rare occasions when Arvin dips his toes into the metaphysics cesspool. Not as hopeless as Deepak Chopra-but the gap's closing.

[@Babyhz]

Arvin is rly cool.

[@jeremahosborne6602]

Too hor r o

[@rudrrrudrr5788]

Thanks for explaining these concepts easily ❤️❤️

[@bf99ls]

From the title I was tempted to scroll on, because I assumed the term ‘purpose’ implies some intelligent design. But I had a quick look at the comments and proceeded to watch the video. Glad that you expanded the term light to include the entire electro-magnetic spectrum. Instinctively think that the term ‘speed of causality’ is more useful though, as it is the speed limit of the transmission of information throughout the universe from the perspective of an observer.

[@alfadog67]

Hi Professor Ash! Since light behaves like a quantum object, that means it travels in superposition, thus its physical properties are modeled by its wave function. Each collapse of an electron energy state causes a new wave function. But these separate, non-entangled superpositioned wave functions don't interfere with each other, but rather only themselves (as demonstrated by the double-slit experiment). Does that mean that ALL the light traveling through spacetime has that same crisp, clean, motionless arena in which to propagate?

[@bog-monster]

Yeah Baby !! 👍💯👌😜

[@succulentsfun]

God said, “Let there be light" 😀

[@JB_inks]

No, a man wrote that in a book

[@JB_inks]

Evidence please

[@michaelportaloo1981]

Who was he talking to?

[@JB_inks]

@@michaelportaloo1981 nice username

[@cartdog3]

The easiest way to conceptualize the 4th spacial dimension is to imagine the cosmic microwave background originating from a single point, and yet being visible all around us. Every direction leads to the single point that the universe expanded from, and at the same time it appears that every point in the universe is the centre...

[@Saurabhgupta23671]

30 seconds into the video and I'm already mesmerised. Sold.

[@dylan_curious]

a fundamental constant of the universe was a groundbreaking discovery, and it led to the development of modern physics as we know it today. Light plays a crucial role in our understanding of the universe, and without it, we would be unable to gather any visual information about our surroundings. The fact that light behaves both as a wave and a particle is a fascinating phenomenon, and it highlights the strange and mysterious nature of the quantum world. The study of light and its properties continues to be an exciting and ever-evolving field of science, and it holds the potential to unlock even more mysteries of the universe.

[@maalikserebryakov]

Hi chatGPT

[@PaulHoward108]

Particles and waves are concepts. The difference is particles are detailed, and waves are abstract. There's no substance duality, because both are forms. The abstract becomes detailed by the addition of information from choices.

[@clurkroberts2650]

Fiat Lux. I’ve always loved light. As a photographer, I studied light as a tool, in essence painting objects with light. But more than that, I realized that visible light, being a small part of the electromagnetic spectrum, is one of the most amazing elements of life.

[@hGUImain]

At 3:30 he says photons obey the schrodinger equation, but some investigation shows they don't because they are relativistic and obey QFT and QED. Is this correct?

[@lastaviusdarby2771]

Note the information provided at 2:34/2:35. What if the electrons are not ejected from the surface of the metal, but instead are ejected due to the collision from the light wave itself? Surely, this possibility would effect our outcome.

[@andrewhamp2893]

Thank you for taking up this issue. Great video... Now, just riffing here, but could it be that if information is the base fabric of the universe, photons/light is the most efficient way to encode "preserve" information? Sort of like a conservation of effort?

[@ArvinAsh]

Sure, but the universe doesn't have a lot of information carriers. Gravity and electromagnetism are the two "carriers" of information. Both travel at the speed of light.

[@jeffg4570]

@@ArvinAsh. Is the information carried by the photon just it’s frequency, or is there more to it than that?

[@werquantum]

“Purpose of light: it’s the fundamental currency used to exchange energy and information from one part of the universe to another.” Brilliant!

[@4apca]

This is just excellent! Thank you Arvin !

[@robeaston4063]

Without light, Simba's kingdom would be very small as no light would be touching anything.

[@massimoacerbis8138]

This guy knows a lot And has a passion to spread his knowledge

[@sonofode902]

3:53 Wave of probability. The probability of finding it at a location if we look there. 11:53 Ubiquitous - omnipresent 12:05 Information. Energy exchange by a Photon.

[@GarryBurgess]

Wow, this is your best video because of the amazing content!

[@elisa20vallejo]

Fantástica explicación, como todo lo que haces. Carlos de Argentina

[@marcocurrin8122]

You should talk to all your friends about it and start going through all the scenarios customer scenarios you go through with your friends the more they’ll start wiping those scenarios out and coming up with better once and then finally you’ll get to the final understanding of where we’re at and what’s going on around us right this moment

[@katakalyptica]

This was one of the best explanations, I ever had heard. Thanks

[@JohnJenkins-ib5wh]

Arvin you are awesome. Even my wife that thinks that Science is a boring subject loves your videos 👌

[@ArvinAsh]

Happy to hear that! Thank you.

[@margrietoregan828]

7:48 For now, let me just say that a significant number of forces you feel would not be possible 7:53 without photons. 7:54 So for example, the friction between your shoes and the ground which allows you to walk, 7:59 or friction between your car tires and the road is fundamentally a product of electromagnetism. 8:05 This is because friction is caused by the electromagnetic interaction between the atoms 8:10 of the two contact surfaces. 8:12 Without light, you wouldn’t feel anything either, because touch is a result of electromagnetic 8:17 interactions between your skin and the surface you are touching. 8:20 And since the very atoms in your body are held together due to the electromagnetic interactions 8:25 between the positively charged nucleus and negatively charged electrons orbiting them, atoms would 8:30 not exist without light either. 8:33 In other words, no light means no atoms, no cars, no houses, no you and me. and no universe 8:40 as we know it. 8:41 Thus, not only would you not see or feel anything, you wouldn’t exist without light

[@youfilin]

Arvin, thank you! Question: What kind of information are we talking about? Not in the human context, but for the universe? Gravity information between objects (is this by photons)? Electric charge? But for what? What kind of life is the universe living?

[@abebass464]

Arvin, don't make mistake by saying that electromagnetic field is mediated by photons! QED claims that electromagnetic field is mediated by "virtual photons" and not "photons"! Virtual photons is a label that means "I don't know what it is", similar to "dark energy" and "dark matter" labels.

[@nvrp]

Thank you Arvin!

[@muthukumaranl]

Absolutely awesome video!

[@halcon2134]

Do communication in the electromagnetic field, right?

[@caseyford3368]

What if it doesn't have a purpose? What if it simply is? Everything is energies. The light we see anywhere,is the energies that produce light. We simply formed partially based on some light. I'm sure there are many beings that exist without any light. It's not needed, but it does have many different effects based on the variables.

[@FortniteWithMyMom]

Holy moly what a great video!!

[@hans-jurgenkallweit2767]

Wonderful video. Every photon carries information from its origin. So spectral anaalisis can determine the chemical element of a star, what sent the photon to us .

[@dr.paulj.watson4582]

Really enjoyed this video.

[@thebeelight]

great video, thank you!

[@Rorol1fted]

Loved watching this video

[@nothingmanofgod.6288]

Your idea of thinking is always interesting awsome i can understand it even with out the real anser at all😕😏

[@eonasjohn]

Thank you for the video.

[@tonyrony1943]

You have a great real concept. It is light a kind of essential energy which make survive all the things in our universe except nt a single bit material

[@alixkaze7750]

This video inspired me to come up with my own hypothesis. Full disclosure: I’m no physicist or mathematician. This is just me letting my imagination run wild with a bit of help from ChatGpt to put it together. The Foundational Photon Fluid: A Blueprint of the Universe 1. Introduction: Across the vast expanse of the universe, a critical element, termed the 'photon fluid', emerges as its foundational fabric. Just as DNA structures biological life, this photon fluid, composed of intricate quantum entities, establishes the core principles of the cosmos, driving its structure and dynamics. 2. Gravity Re-envisioned: Historically conceptualized as a force, gravity within this paradigm undergoes a transformation. As particles traverse and interact within the photon fluid, the gravitational effects are the direct consequences of these interplays. This mechanism not only unifies quantum mechanics with Einstein's relativity but provides a tangible, replicable basis for gravity's manifestation. 3. The Mechanics of Quantum Entanglement: The mystique surrounding quantum entanglement dissipates when analyzed under the photon fluid paradigm. Entangled particles are not ambiguously connected but are distinctly programmed by the photon fluid. This intrinsic programming, rooted in the fluid's properties, leads to their synchronized states and behaviors, paving the way for precise modeling and predictive analytics. 4. Dark Matter & Energy - Integral Aspects of the Photon Fluid: Dark Matter: Contrary to elusive depictions, dark matter emerges as specific quantum states within the photon fluid. These unique states interact with known particles, producing the gravitational effects attributed to dark matter. As such, dark matter isn't an external entity but an inherent aspect of the fluid's quantum behavior. Dark Energy: Dark energy, responsible for the universe's accelerated expansion, is the macroscopic expression of the photon fluid's inherent tension or energy state. Rather than an enigma, it becomes a quantifiable property driving cosmic expansion. 5. Concluding Remarks: With the photon fluid paradigm, the universe unveils itself not as a collection of disparate phenomena but as a cohesive system, governed by this foundational fluid. As we embark on focused experimental endeavors and mathematical modeling, this perspective promises to shed unprecedented light on the cosmos's most profound mysteries. Thank you for inspiring me. I had fun. 😅

[@soundcoremusicmix]

Awesome! 🎧🎶🤩

[@MrKotBonifacy]

4:41 - if the train is "moving at 1/2 speed of light" then the light shone from the torch of the stationary person (red one) also travells at 1/2 speed of light... ??!

[@ArvinAsh]

No, they both travel at the speed of light

[@MrKotBonifacy]

@@ArvinAsh Yes, they do - in theory (and in real life too), but I'm referring to that somewhat flawed (IMO) animation. Namely, the speed of the light cone shone by the "passenger" doesn't travel fast enough (in my eyes, at least, but that's a secondary matter), and yes, the "bystander's" light travels at the same speed as "passengers" light, but toward 4:45 its speed basically matches the speed of the train. In other words, my gripe is with the animation, and frankly I really detest this sort of "brain farts" all too common and frequent in "popular science" videos. My guess is those "outsourced" animation guys either don't care or don't know (or both) - for them it's "hey, if it looks cool then it's cool - thus OK", and who cares if narrator says "going over" (animation shows "going under") or "clockwise" (animation shows COUNTER-clockwise rotation). Aw, who cares, right? Um, "wrong", as those kind of "visual aids" are suppose to AID the understanding of the subject, NOT obfuscate it by presenting something that elicits instant "whisky tango foxtrot?" from the audience... Or, worse still, looks like "random stock video inserted for no rhyme, although... for no reason either". Well, I guess my reaction is best described as an "idiosyncrasy", in the sense "acute allergy". I do enjoy watching your videos, but... well, whatever. Have a nice one : )

[@ThomasistheTwin]

Light is not made of material things but is the energy that drives the material. “Light is a sound wave in the Æther.” - Tesla. Still no explanation as to why however.

[@3rdcoasttoast201]

Maybe it's because what we call a "particle" is the interaction between energizes and forces. We detect waves as the energies and forces dissipate over distance. Also when an object travels along a path and spins around an axis, the path viewed from the side is a wave

[@turkishwithemre]

I feel like we are part of a microprocessor that checks and process the things in speed of time ( loop ). the thing I did not understand what is the purpose of this microprocessor?

[@jamesraymond1158]

You point out that the speed of light is a function of permittivity and permeability of space. These are electromagnetic factors. Everyone assumes that gravitational waves also move at the speed of light. But grav waves are unrelated to EM factors. I would love to see you go into this question in one of your videos. Why should permittivity and permeability of space affect speed of grav waves?

[@wearethefruitoftheuniverse]

If my slits were done, say on an extremely thin gold foil, thin enough to minimize it's thickness while remaining opaque to light. I wonder if light is so fast that it bounces off of the thickness of the material creating a pattern. Could the material be so thin that the results begin to vary

[@chrisschurchill2003]

The fact that life knows that light exists and uses that light for it's own existence is remarkable

[@winstonsmith8240]

Dumb question, but if there are no objects of mass in a universe without electromagnetism, how can there be gravity? Am I wrong in thinking that in GR the past determins the future, and in QM the future determins the past? Sort of makes sense. Like matter and anti matter. Both sides are equal.

[@ocococococococococococococ3267]

mass has nothing to do with electromagnetism so gravity would still exist

[@ArvinAsh]

Atoms would not exist, but mass, which is largely determined by the binding energy inside nuclei, due to the strong force, would still exist. Gravity, as we understand it, would still exist. Anything with energy (or mass) would curve spacetime.

[@MemphiStig]

A physicist friend and I used to wonder about the beginning of the book of Genesis, not from a religious standpoint, necessarily, but simply from the idea that it sort of parallels the theory of the universe's actual beginning, and it seems to stem from that one crucial moment when God says "let there be light." That this *is* where everything begins and that it *is* the most meaningful event of the Beginning, whether attributable to a deity or not, seems a remarkable coincidence of the two paths, which otherwise seem to be in constant opposition.

[@ArvinAsh]

Actually in the Big Bang model, no light could travel until about 300,000 years after the beginning.

[@MemphiStig]

@@ArvinAsh And this is part of the parallel, because "God created the heavens and the earth" which was empty and without form (1:1) before saying "let there be light" (1:2). And on the cosmic time scale, a verse could be a great amount of time too, since time was not yet defined (and one could argue that the "days" of creation aren't literal days as well). Don't get me wrong. I'm not saying there's a religious connection or arguing in favor of the Bible. To me, it's just a philosophical curiosity, not a substitute for proper science. But it seems like one of those times when our early mystical explanations came eerily close to the truth without really knowing it.

[@Seekthetruth3000]

Light is life. Nice video.

[@doctor02new]

Well done indeed!

[@Unshou]

Fascinating - hadn't really looked at it from this perspective. Really nicely explained. However, as I understood it, it's not so much that light is the reason we exist but rather the electromagnetic interaction is the reason we exist. Light just happens to be a by-product of this interaction and carries information and energy to the rest of the universe about said interaction.

[@crismamuerta]

Dude, I think you are one of the coolest guys I’ve ever known on the internet.