What is an Electromagnetic Wave?

[@visasaarinen6051]

That was well explained. But in this example we had this charged particle which was oscillating and thus generated the oscillating E field we can call EM wave. But we get EM wave when ever charged particle is in acceleration don't we? So that it doesn't need to osculate? Is there a way to explain the emission of em wave in that case? Also a student of mine asked about the phase shift of 180 degrees that occurs in the Electric Field of a EM wave, when reflected from an optically denser medium. Is there an intuitive way to explain that or is it just pure math? Thanks in advance!

[@PhysicsMadeEasy]

Hello Visa, Question1 (acceleration of charged particle): Yes, we do, because accelerating the charge, will create a perpendicular disturbance in the field lines (thus a variation in the direction of the E Field). A variation of the electric field is radiation. A good visualisation is provided by this video: kzbin.info/www/bejne/q4elZHqVesmco5Y. And you can explore more with this inspiring simulation: kzbin.info/www/bejne/pXmaiIWBnNF-hM0 The second question was trickier (why phase change of pi). It is hard to avoid the post high school math here… and it is true that most lecturers explain that it occurs and when, but not why… You can roughly see it that way, by referring to the amplitude reflection coefficient Erefl/Eincident = r = (n1-n2)/(n1+n2). When n2>n1 the ratio of amplitudes is negative, implying a phase flip. More info here: www.usna.edu/Users/physics/mungan/_files/documents/Scholarship/PhaseChange.pdf Good questions! I hope my answers help you.

[@visasaarinen6051]

@@PhysicsMadeEasy thank you! This was exactly what I was looking for!

[@JL-fh4qw]

@@PhysicsMadeEasy When an electric wave oscillates is there a delay for when the magnetic field oscillates?

[@PhysicsMadeEasy]

@@JL-fh4qw Hi J.L., in vacuum , no there is not: the oscillation and of the E field and that of the M field are in phase.

[@Littleprinceleon]

@@PhysicsMadeEasy please, can you provide a suggestion for a somewhat in-depth but still intuitive source on fields (classical versus quantum)? Preferably in the form of YT videos. Thanks a lot. (I've tried Sean Caroll's Biggest ideas of the universe, but cannot put those pieces together in a more or less coherent whole).

[@zhe0ops]

I have to say this is the first time I am starting to understand what eletromagnetic wave is. Thank you.

[@tuckercoffin2164]

Omg same!

[@raphaelfrey9061]

You probably never saw eugene khutoryansky

[@sheiladefauw5292]

@@raphaelfrey9061cfg❤rrdr de😂drrrrrrre

[@sheiladefauw5292]

@@raphaelfrey9061😂tutu y he ftme

[@sheiladefauw5292]

@@raphaelfrey9061 w

[@supergirl1892]

This little video captured what miles of blackboard, chalk and textbooks couldn't. Thanks

[@PhysicsMadeEasy]

Hi SuperGirl, I am glad you enjoyed this video. Thank you for letting me know :-)

[@muhdibrahim8817]

How i wish i had a teacher like you in my life SIR.I love physics but graduated with a third class degree and still doing in teaching it in my locality nigeria. Thanks for the video my mentor.

[@PhysicsMadeEasy]

Hi Muhdi, thank you so much for these very kind words. All my wishes for a good continuation of your studies of physics, and also my best wishes of success in inspiring young students when teaching it! :-)

[@LightSaber77]

This is one of the most powerful explanations I have ever seen. Please make more videos.

[@PhysicsMadeEasy]

I sure will, thank you Bharath! There are many more on the channel. Feel free to explore!

[@billaday8589]

@@PhysicsMadeEasy , thank you !

[@swellerpal2007]

i haven't imagined that i could be able to understand the electromagnetic waves but after watching this i feel its amazing

[@PhysicsMadeEasy]

It is, amazing isn't it! And often easier to understand than many textbooks would make you think... I lie in the title of my channel: Physics does not need to be made easy. It is already :-)

[@gtfantafizzy1295]

Very humble, respectful and knowledgeable person. Thank you.

[@suhadalkhafaji8995]

Omg finally I found a professor I like

[@rajendrapatel9758]

Good

[@zhiyiwang6466]

For those wondering why the magnitude of E is changing: “Alternating current (AC) is an electric current which periodically reverses direction and changes its magnitude continuously with time”

[@phoumint]

Thank you so much ❤

[@Lorenzo-zg3ct]

Question. How can it reverse directions?

[@frankdimeglio8216]

@@phoumint EINSTEIN IS UNCOVERED BY DIMEGLIO: WHAT IS E=MC2 is dimensionally consistent, AS TIME is NECESSARILY possible/potential AND actual ON/IN BALANCE; AS ELECTROMAGNETISM/energy is CLEARLY AND NECESSARILY proven to be gravity (ON/IN BALANCE); AS the rotation of WHAT IS THE MOON matches the revolution. Indeed, consider what is the man (AND THE EYE ON BALANCE) who IS standing on what is THE EARTH/ground; AS touch AND feeling BLEND; AS ELECTROMAGNETISM/energy is CLEARLY AND NECESSARILY proven to be gravity (ON/IN BALANCE). Indeed, WHAT IS GRAVITY is, ON BALANCE, an INTERACTION that cannot be shielded or blocked. GREAT. BALANCE AND completeness go hand in hand, AS it all CLEARLY makes perfect sense ON BALANCE. Magnificent. By Frank Martin DiMeglio The sun's tide-generating force is about half that of the moon. One half times one third is one sixth. Consider what is water. The density of what is the Sun is believed to be about one quarter of that of what is THE EARTH. The diameter of WHAT IS THE MOON is about one quarter of that of what is THE EARTH. The density of the human body is about the same as water. Lava is about three times as dense as water. Pure water is about half as dense as packed sand/wet packed sand. We can multiply one fourth times two thirds in order to ALSO get the surface gravity on the Moon in comparison with what is THE EARTH/ground. The gravity of the Sun upon the Moon is about TWICE that of what is THE EARTH. The lunar crust is about TWICE as thick on the far side of what is the Moon. Notice what is the TRANSLUCENT AND BLUE sky ON BALANCE. The maria (lunar “seas”) do occupy ONE THIRD of the visible near side of what is the Moon. One half times one third is one sixth. What is E=MC2 is taken directly from F=ma, AS TIME is NECESSARILY possible/potential AND actual ON/IN BALANCE; AS ELECTROMAGNETISM/energy is CLEARLY AND NECESSARILY proven to be gravity (ON/IN BALANCE); AS the rotation of WHAT IS THE MOON matches the revolution. Consider what is the orange AND setting Sun ON BALANCE. Consider what is THE EYE ON BALANCE. Consider what is the fully illuminated AND setting/WHITE MOON ON BALANCE !!! What is E=MC2 is dimensionally consistent. The land surface area of what is THE EARTH is 29 percent. This is EXACTLY between (ON BALANCE) what is one third AND what is one fourth. The maria occupy one sixth of what is the Moon. The BULK DENSITY of what is the Moon is comparable to that of (volcanic) basaltic lavas on what is THE EARTH/ground. Consider what are the tides. ONE HALF times one third is one sixth. ONE QUARTER times two thirds is one sixth. What is gravity is, ON BALANCE, an INTERACTION that cannot be shielded or blocked. CLEAR water comes from what is THE EYE (ON BALANCE). ON BALANCE, what is THE EARTH is ALSO BLUE !!! GREAT. BALANCE AND completeness go hand in hand. What is LAVA IS ORANGE, AND it is even blood red. Awesome. Yellow is the hottest color of lava. Blue is the hottest flame color. Note: Consider what is the blue flame. The lunar surface is chiefly composed of pumice. By Frank Martin DiMeglio In understanding SPACE, what is gravity, TIME, AND time dilation (ON BALANCE), it is important is it to understand what is a BALANCED displacement of what is SPACE. ELECTROMAGNETISM/energy is gravity ON/IN BALANCE. Consider what is E=MC2. TIME is NECESSARILY possible/potential AND actual ON/IN BALANCE. Consider TIME AND time dilation ON BALANCE. (c squared CLEARLY represents a dimension of SPACE ON BALANCE.) Indeed, the stars are POINTS in the night sky ON BALANCE. The rotation of WHAT IS THE MOON matches the revolution. Consider what is THE EYE, AND notice what is the TRANSLUCENT AND BLUE sky ON BALANCE. NOW, consider what is the BALANCED MIDDLE DISTANCE in/of SPACE. CLEARLY, BALANCED inertia/INERTIAL RESISTANCE is fundamental (ON BALANCE). “Mass"/ENERGY IS GRAVITY. ON BALANCE, consider what is the orange (AND setting) Sun. “Mass"/ENERGY involves BALANCED inertia/INERTIAL RESISTANCE consistent WITH/as what is BALANCED electromagnetic/gravitational force/ENERGY, AS ELECTROMAGNETISM/energy is CLEARLY AND NECESSARILY proven to be gravity (ON/IN BALANCE); AS gravity/acceleration involves BALANCED inertia/INERTIAL RESISTANCE (ON BALANCE) consistent WITH E=MC2, F=ma, TIME, AND time dilation ON BALANCE. This CLEARLY AND NECESSARILY represents, DESCRIBES, AND INVOLVES what is possible/potential AND actual ON/IN BALANCE, AS ELECTROMAGNETISM/energy is CLEARLY (AND NECESSARILY) proven to be gravity (ON/IN BALANCE). Notice what is the fully illuminated (AND setting/WHITE) MOON ON BALANCE. Great. TIME is NECESSARILY possible/potential AND actual ON/IN BALANCE. Indeed, inertia/INERTIAL RESISTANCE is proportional to (or BALANCED with/AS) GRAVITATIONAL force/ENERGY; AS ELECTROMAGNETISM/energy is CLEARLY AND NECESSARILY proven to be gravity (ON/IN BALANCE). This CLEARLY explains what is E=MC2 AND F=ma ON BALANCE, AS TIME is NECESSARILY possible/potential AND actual ON/IN BALANCE !! (Consider TIME AND time dilation ON BALANCE.) Great. Indeed, consider WHAT IS THE EARTH/ground ON BALANCE. I have mathematically proven why the rotation of WHAT IS THE MOON matches the revolution, AS ELECTROMAGNETISM/energy is CLEARLY (AND NECESSARILY) proven to be gravity (ON/IN BALANCE). Consider TIME AND time dilation ON BALANCE, AS the stars AND PLANETS are POINTS in the night sky ON BALANCE; AS c squared CLEARLY represents a dimension of SPACE ON BALANCE. (Consider what is THE EYE ON BALANCE.) I have mathematically proven what is the fourth dimension, AS ELECTROMAGNETISM/energy is CLEARLY AND NECESSARILY proven to be gravity (ON/IN BALANCE) !!! I have explained why what are OBJECTS may fall at the SAME RATE. By Frank Martin DiMeglio

[@figefago]

@@Lorenzo-zg3ct You have to reverse voltage, assuming you have battery then change + with - and vice versa :) If you do it more more frequently then you have AC current :D

[@imallrightwhosleft4832]

Thank you for rescuing me out of all the confusion on em waves. Your 3 minute presentation is worth the research of a lifetime. 🙏🙏🙏🙏

[@PhysicsMadeEasy]

Thank you so much Imallright. Some people spend a lifetime of research looking for complex things, which is good and useful for society. Surprisingly, it needs also a lot of time and teaching experience to present basic concepts in a pedagogical way while remaining rigorous... (I wished I had me when I was a student lol!)

[@kousei-sama7827]

This is the 1st video where I actually understoood EM wave and how radio works, thanks!

[@muhammadraqibulislamraqib8134]

Finally I understand the what is electromagnetic wave actually. Thank you Professor, May Allah Subhanahuwataala bless u.

[@PhysicsMadeEasy]

Thank you Muhammad for your kind wish. I am glad my video helped you.

[@kamariahrajainthiran1805]

@@PhysicsMadeEasy thanks for sharing your simple information 🙏👍

[@lananhnguyen7415]

Wow. Thank you so much. I self-taught AP physics 1 and 2, and got 4 on both the exams, but I was struggling to grasp this concept for so long. You made it so easy to understand this. I wish I found you 2 years ago.

[@PhysicsMadeEasy]

a 4 in AP Physics while self taught. Well done! Thank you so much for the kind words!

[@lananhnguyen7415]

Thank you so much for the encouragement. Please keep up with your good work. That help students like me a lot.

[@ngwenyareacts]

NICELY DONE 😊😊😊❤❤❤❤ I AM HAPPY FOR YOU 👍🏿👍🏿👍🏿🙏🏿🙏🏿🙏🏿✌🏿✌🏿✌🏿👊🏿👊🏿👊🏿

[@Byynx]

What a masterpiece of explanation. It's amazing how with a combination of videos we can understand great things.

[@PhysicsMadeEasy]

Hello Byynx, thank so much for your kind words. I am so glad that my work enlightens people on the wonders of our universe! Comments like yours make me feel like achieving my goals 😊

[@lanewilder912]

🎉❤😢

[@tomatoeggs48]

Your explanation of the topic was so clear, I never thought I could understand it so easily! Thank you 😊

[@PhysicsMadeEasy]

Merci Celine :-)

[@sudds82]

This 3 minute video was enough for me to subscribe to your channel. Great stuff!

[@Sunnyk6631]

sir I can't thank you in words . ❤️❤️ I don't know why all teachers are not like you . my teacher explained me and whole KZbin explained me but I was not getting feel of this topic . I was able to solve em wave numericals but wasn't understanding what's happening in real . but now my all concepts are crystal clear. again thank you so much 🙏🏻🙏🏻🙏🏻💖. I have subscribed your channel and pray for millions of subscriber on you channel . ❤️🙏🏻🙏🏻🙏🏻

[@PhysicsMadeEasy]

Thank Sunny, I am super happy that this video helped you so much! Please keep praying for that milliion subs... It's quite a long way haha. It would make me euphoric though to know my work helped so many people !

[@engineeringnerds16]

So far d most comprehensive explanation of electromagnetic waves available on Internet .....!!!! Thank you 🙏

[@PhysicsMadeEasy]

You are welcome. I am glad that this video brings a little clarity to so many!

[@Rocky_Jay]

You knew exaclty what to explain how to explian, most videos skip the basic parts and go straight into concepts living us in the woods without much explianing, but you sir knew exaclty what our issues where with this topic and you explianed it to us not as if we were fellow prefesors but as if we were what we are and that being students. THANK U KEEP IT :)

[@PhysicsMadeEasy]

Hello Helias, thank you for your kind words... You summed up why this channel exists: when I teach my real life students, I always make sure that the basic concepts I need to use are clear for them, otherwise, it can create or even crystallize confusion in their minds... I made this channel , focused on the basics, so that students can fly with their own wings...

[@Bhisma_official369]

Extremely underrated 😭

[@jonathanfriedlander8563]

That is the best explanation I have ever come across , any electrical tutor / electrician / teacher I have asked to explain this has been stumped . Thanks very much !!

[@PhysicsMadeEasy]

Hello Jonathan, I appreciate very much you letting me know. It gives me a boost of energy and encouragement when I read that I reach my goal like this :-)

[@Potatomatoo]

Thanks a lot I never imagined it that way. You definitely made me understand this topic better. The relation between electron/change movement and light was just mind blowing!

[@PhysicsMadeEasy]

it is, isn't it? That's why I like physics! :-)

[@TomarVader]

I'm brazilian, finally i can understand it, this is, learn how eletromagnetic waves are origninated. Thanks!!!

[@PhysicsMadeEasy]

Hi Tomas, then it means my video has reached it's goal. Thank for the feedback, it's motivating!

[@maxheuser4968]

Wish we had these excellent, graphic learning-assist videos when I was doing electrical engineering at 'Varsity in the early 1970s

[@PhysicsMadeEasy]

Thank you Max for your comment, especially that I do the graphics myself (just using Powerpoint :-) ). Oh, and I agree. Sometimes I think that if I had access KZbin material when I was a student (late 80s, early 90s), my life as a student would have been much less painful, and I probably would have won a bunch of Nobel prizes since haha! Yet, the grass appears always greener elsewhere: I still wonder why the average level of young people in maths and sciences has been falling these last few decades (according to many statistics). It's quite counterintuitive...

[@hihi-qh3sj]

The explanation was superb! I learned a lot in a span of almost 4minutes than our 1hr class discussion. Thumbs-up! 👍👌

[@martinstubs6203]

@jacobchristner7129 Well you might as well start teaching the right stuff: No more magnetic fields, only electric charge.

[@user-ky5dy5hl4d]

@jacobchristner7129 If you are teaching this stuff then answer me: what causes the speed of light?

[@SupratimBhowmick]

This was by far the easiest explanation that I have encountered.

[@PhysicsMadeEasy]

I am glad you enjoyed my approach. Thanks for letting me know :-)

[@TheRoul273]

Indeed really well explained. I have seen a few videos on this topic, but you explained it the best! Well done.

[@saketupadhyay]

So short, crisp and to the point. Thanks teacher

[@PhysicsMadeEasy]

You are welcome... That's what I try to do: Make physics easy. Thank you for your kind feedback :-)

[@stervingsolomon205]

Awesome explanation Sir, Hats off 🙏🏻😇 You did the explanation and theory in a calm manner , like not too speed not too slow.... Its quite fascinating...

[@jopan7022]

Complicated concepts made easy! Great job!

[@mubinsaeef8529]

I just stumbled onto this video and i hope you never stop creating more videos

[@PhysicsMadeEasy]

Thank you Mubin for your kind words. It's true I haven't posted a video for a while: so much on my plate right now! But making new videos is the plan, so expect a burst of new fun physics videos when the time comes!

[@user-jz9bj6ub7h]

Now I undrestand

[@richtaylor6039]

Just discovered your channel. Very enjoyable viewing. Love your style of presentation. New sub.

[@PhysicsMadeEasy]

Hello Rich. I am glad you enjoyed your visit to my channel. Thank you for you kind and encouraging words. You are welcome to visit again anytime :-)!

[@deepakmarathe7347]

Well explained! Thank you

[@PhysicsMadeEasy]

You are welcome Spammer :-)

[@HassantlaisHassan-nz4ts]

Though I watched your videos now, as a physics student who always has questions, my dream is to communicate with you doctor. I hope I will achieve my dream and ask you doctor, with my all respect to you❤️

[@PhysicsMadeEasy]

Hi Hassan, you can always check out my tutoring website to know how it works (physics-tutor.nl/), but I have to tell you that my teaching agenda is currently full for the next few months...

[@user-11528]

Nicely explained. My Physics teacher never said about this.

[@hamzamohamed7935]

This art in explaining physics thankyou😊

[@sakibulhasan7697]

This was definitely amazing! I was looking for an explanation how electromagnetic waves work or travel, and this was the video that finally made me understand the whole concept. But here are some questions, the oscillating electrons create the oscillating electric field which results in EM waves, so does this wave go on forever? Does it not get weakened as it travels? If so, then does light get weaker too as it travels (Which I think yes)? And is that the same reason we see faded light when it comes from a distance? And how was the very first light created without an oscillating charge? Thanks a lot! Your videos are great, keep it up~

[@PhysicsMadeEasy]

Hello Sakib, - The oscillating electrons create the oscillating electric field which results in EM waves, so does this wave go on forever? - If there is no other electric field to disturb it on the way, yes it will. - Does it not get weakened as it travels? - In a purely static space empty of gravitational mass, no, it will not lose energy and go on forever. - If so, then does light get weaker too as it travels (Which I think yes)? - Light is the sum of rays. Each ray is an electromagnetic wave. A light source (or antenna) emits in all directions. Draw a point on a piece of paper (the source of light). Draw twelve lines going away of that point (in different directions). What you perceive as the intensity of light, is the concentration of these lines. You see they are more concentrated close to the source than when they are away… That is what you perceive as the weakening of light. But each line stays a line of the same thickness, each ray conserves its energy… - And how was the very first light created without an oscillating charge? - You mean at the beginning of the Universe? Charges were there before light (electric charge is a conserved property).

[@sakibulhasan7697]

@@PhysicsMadeEasy Thanks a lot! This explains my question~

[@aalerasul5382]

Only now I understand the EM wave

[@sawindersingh4878]

oscillating force of oscillating electric field of emitters electron displaces the electron of receiver continuously which cause oscillation of receiver electron And thus work is done by emitter electron on receiver electron and as we know work is transfer of energy Great 👍 keep it up and upload more videos your physics is beyond from this universe you are amazing 👏 You prove physics os love ❤ 😍

[@PhysicsMadeEasy]

Thank you for your kind comment Sawinder :-)

[@zwnrcc]

It took some time for me to process it but I get it now! Thank you very much!

[@PhysicsMadeEasy]

You are welcome. I am glad my work helped you learn something new :-)

[@DanEmino]

This was great. I love a short, precise explanation!

[@PhysicsMadeEasy]

Hi Dan, I am glad you liked it. Thx for the feedback :-)

[@sandeepbishnoi5398]

The best explanation I have ever got for EM waves Tnku professor

[@PhysicsMadeEasy]

Thank you for your kind words. I am glad my work helped you :-)

[@troymartin6942]

You made it so easy to understand

[@akextremerickert]

Wow cool. It took me 37 years to begin to grasp what light actually is.

[@PhysicsMadeEasy]

Better now than never Akextremerickert haha! How did it make you feel to understand that? Please note though that this is just one of the two main interpretations (that of classical physics).

[@keithangriffin-nm4jh]

Beautifully explained.

[@venujohn9362]

For the first time I got a clarity about electromagnetic wave

[@PhysicsMadeEasy]

Thank you for letting me John. It encourages me to read your words!

[@ADITIPUROHIT.]

Bestest video ever made on this topic. Thanku so much sir!💜

[@PhysicsMadeEasy]

Thank you very much for your comment Aditi. I am glad you enjoyed the video :-).

[@huntermaze9875]

1) Can you explain how the receiving antenna knows which emitting antenna to pick up. 2) How does the antenna "read" the electron, I figure something so small and fast would be hard to track precisely. If you could answer these that would be awesome! Great video btw!

[@PhysicsMadeEasy]

Hi Hunter, the receiving antenna actually receives all signals from all nearby emitting antennas. It is a small filtering circuit located in the circuit containing the receiving antenna that will select the frequency of interest thus the emitting antenna of interest (for example, with vintage radio receivers, the passing band of the filtering circuit is controlled by a rotary button). The antenna does not "read" one electron, but trillions and trillions that are submitted to the EM wave the same way (statistically, the evolution of the resulting current). I hope this helps!

[@architchitre7867]

Hands down the best explanation! Thanks...

[@amarbadran5699]

Thanks too much I am from Egypt this is the first time I understand how how lamp works and antena

[@PhysicsMadeEasy]

Hi Amarbadran. I am glad you enjoyed the video and that it helped you understand how an antenna works. Please note that this is not exactly how a standard lamp works... the concept in the video works for low frequency EM waves like Radiowaves or microwaves. But if you tried to do this with visible light, although conceptually correct (it is the acceleration of charged particles that generate light), other phenomena would come into play and the experiment would not work. If you want to know how light is emitted by the sun or by a light bulb, check my videos about black bodies.

[@amarbadran5699]

@@PhysicsMadeEasy I will see it thank you for making physics simple and interesing

[@shareeetheplug6701]

Very simple short and concise

[@LECityLECLEC]

I love your work! thank you for making Physics not just easy but cool!

[@Antonio-bc2ue]

Amazing video! Thanks for your work!

[@samikshapandey295]

I must say this vdo is quite short and at the same time informative too along with an intuitive understanding 👍

[@PhysicsMadeEasy]

Thank you Samishka :-)

[@muhittinselcukgoksu1327]

Thank you so much. What a nice presentation of electromagnetic wave.

[@PhysicsMadeEasy]

You are welcome, and I am glad you liked it.

[@Narendra_modi354]

Sir, I understand very well thank you so much have a good day❤❤

[@PhysicsMadeEasy]

Hi Abbasi, thank you for your feedback. You too, enjoy your day, and if you are a student, good luck with your studies!

[@swap7202]

NICE EXPLANATION, 1] BUT AT 01:50 THE SECOND BAR WERE PLACED IN THE ELECTRIC FIELD SO THEY CAN TRANSMIT SIGNAL IN THAT CLOSER DISTANCE BETWEEN THEM, WHAT IF THE BAR IS PLACED TO FAR AWAY, AT SUCH DISTANCE THAT THEY ARE NOT IN THE FIELD, WILL THEY STILL TRANSMIT SIGNAL, HOW? 2] WHY ALL ELECTROMAGNETIC WAVES PROPAGATES AT THE SAME SPEED IN VACCUM REGARDLESS OF THEIR ENERGY. FOR EG, THOUGH THERE IS MUCH DIFFERENCE BETWEEN ENERGIES OF GAMMA RAYS AND RADIO 📻 WAVES, THEY TRAVEL AT THE SAME SPEED, WHY? 3] FROM WHERE DOES THESE ELECTROMAGNETIC WAVES/RADIATIONS GET ENERGY? 4] WHAT IS THE DIFFERENCE BETWEEN 'ELECTROMAGNETIC WAVES' AND 'ELECTROMAGNETIC RADIATION' ( I AM ASKING THIS QUESTION BECAUSE WE USE THE TERMS VELOCITY AND SPEED INTERCHANGEABLY WRONG, SO DON'T WANT TO BE WITH ELECTROMAGNETIC MAGNETIC (WAVES "OR" RADIATION) WAITING FOR ANSWER.

[@PhysicsMadeEasy]

Hello Swap, 1/ Well if you move away from the transmitting antenna of a radio station, you’ll end up having trouble receiving your favorite radio show ! The signal will get weaker and weaker and then wil get lost in noise. Concretely, the energy of the EM wave decreases as the inverse square of the distance. 2/As you know, the speed of light is invariant. Using classical physics, one can show that the energy carried by an EM wave is related to the amplitude of the oscillation of the electric field and the pulsation of the wave (or frequency of the wave). Using quantum mechanics, it depends on the density of photons and their associated frequency. 3/ The source of an EM wave is an oscillating charge. An oscillating charge implies an oscillating force applied to it. The work provided by that force to the charge is the energy source of the EM wave. 4/ The difference is not physical, just semantic. When considering classical physics, one should use the term EM Wave. When considering quantum physics,, one should use EM Radiation. Physically, these describe the same phenomena, the difference is just a question of perspective. Oh, and consider using small caps when writing. Large caps means that you are shouting or screaming. Physics is a subject that should always inspire coolness ;-)

[@sweetblues3230]

i like short explanation and I like this how you explain understandable way❤

[@PhysicsMadeEasy]

Thank you Sweetblues for your Sweet feedback :-)

[@JamesTaylor-ng1zt]

I love the way he says cosine 1:10

[@phoumint]

Thank you so much for this amazing video. Now I have a base understanding of how electromagnetic wave works.

[@PhysicsMadeEasy]

Great Mint, I am glad I could help

[@phoumint]

@@PhysicsMadeEasy I want you to know that You are an amazing teacher ❤.

[@jackson-aka2gs749]

Great example and explanation. Great work, thank you.

[@PhysicsMadeEasy]

You are welcome, I am glad it helped!

[@TomarBoroDada]

thank you for this amazing video explanation sir !!⚡💡

[@asifalamjoy9530]

At last someone in this planet has given me some clue to understand what EM actually is.

[@PhysicsMadeEasy]

Thank you Asif. But... actually, I am not from this planet...

[@asifalamjoy9530]

@@PhysicsMadeEasy then which planet are you from sir?☺️☺️☺️😊😊😊

[@suhassuha3174]

Very nice video sir. Even I am not in physics background I love to watch your videos in my break time

[@PhysicsMadeEasy]

That's wonderful Suhas! Physics is a fascinating topic when you get the basics. I am glad that you see it as a hobby, and that it provides you intellectual breaks in your daily life :-)

[@QQ-nd3qq]

Dude, this video was awesome! Well done! It gave me a greater understanding of what light is. Now if you really want to blow my mind, explain the role of photons in this. When that bar in the example is emmiting visible light in the electromagnetic spectrum, is it also emitting photons? And does that mean....as far as particles go...infrared also produces photons....and even radio waves produce photons?

[@PhysicsMadeEasy]

Hi QQ, in this video, i remain in the framework of classical physics that sees light as the propagation of the oscillation of an electromagnetic field. In quantum mechanics, light is viewed as a flow of particles called photons. These photons are like tiny pieces of energy, like localized pulses, which have thus a frequency and a wavelength (E-h* frequencyf=hc/wavelength. that frequency or wavelength has the same value as the one that shows up in the classical description of light. So yes, visible light is made of "visible" photons, infrared is made of "infrared" photons and radiowaves are made of "radio" photons.

[@QQ-nd3qq]

@@PhysicsMadeEasy Wow...thanks! My mind is blown! Now I'm wondering if photons are just the intersection of two different electromagnetic waves with the same frequency....

[@justarandomdude.9285]

Science is mind blowing!! 🧑‍🔬

[@PhysicsMadeEasy]

It is, isn't it. Once a student starts getting it, he/she can become irremediably hooked!

[@user-vi1fx6dy7f]

Well explained, had difficulties understanding this phenomenon previously

[@PhysicsMadeEasy]

Hello Egbe, so my work has reached its objective then! I am glad I was able to help!

[@Greebstreebling]

I failed A- Level Physics in 1972. I found the level of abstraction was very demanding. 'Using Newton's equations of motion, explain how a horse can pull a cart along a horizonatl track'. I felt there was 'Something Deply Hidden'. Give me one of Sean Carroll's multiverse wave functions any day....

[@PhysicsMadeEasy]

June 1972! I was just one year old then, so obviously I do not know how the A-Level exams were at the time. But today, this type of question still exists. It's a bit of a late advice, haha, but what I usually say to my students taking A-Level Physics is to work on many past papers in order to understand the A-Level exam philosophy and its pattens. Yes even if you have a good abstract understanding, it may not be the one they want to see (i.e. no specific 'marking' keywords in your explanation), and you could end up with a fail. There is a way to answer these questions and get full mark, and this is attainable by 'learning the exam'. Thanks for the reference to Sean Carroll's. I didn't know about him so checked him out, looks super interesting. Is he a modern Everett? I am ordering a book to check it out thank to your comment!

[@vanshitameena5844]

Loved it. Clearly explained in such a short span!

[@PhysicsMadeEasy]

Hi Vanshita, thank you for letting me know you enjoyed the video :-)

[@hemalpatel9005]

nice video, no one has explained me electromagnetic waves this easy.

[@PhysicsMadeEasy]

Thank you for your comment hemalpatel, I am glad my approach was useful to you.

[@SC-rb2jr]

Very easy to follow but very informative.

[@WayneMickel]

My uncle worked with lazers in the 1970's for Owens Illinois he also invented the gs chromatograph to analyze the gas bubbles in glass he was a pioneer in the field.

[@PhysicsMadeEasy]

In the late 60s, early 70s, my father worked at the maintenance of bridges. He got tired of having to drive to the sites, and crawl inside the bridges each time he needed to make measurements. So, he created a kind of internet using phone lines by connecting sensors to basic 8-bit chips and coding a communication protocol in hexadecimal, so that he could control and read these sensors from the comfort of his office :-)

[@alansewell7810]

I consulted for Owens Illinois for about 10 years. It was a great innovative company in its prime.

[@diyvideojunk2066]

Excellent explanation, thank you

[@noahnoah1454]

I never understood this when I took Physics 102, two courses in Electromagnetic and a course in antenna design.

[@PhysicsMadeEasy]

Hi Noah. I am super glad that I could clarify this for you. Actually, when you take a course, think about looking at other (serious) sources. Feynman Lectures are great for that (if you take the time to read and ponder every word that he says)! These are free for download on the internet.

[@noahnoah1454]

@@PhysicsMadeEasy will do sir.

[@AHalo2019]

Ooh i didn't know about that i always wondered why light want to travel in roller 🎢 coaster way . Now i know its a graph only E vs T . Thanks .

[@PhysicsMadeEasy]

Hi Tokyo tales, If you fix a position and look at the E field at that position while light passes through it, you will indeed get a sine curve (the x axis is time). But you also get a sine curve when you fix time (you take a picture where the x axis is position). The influence of the oscillation of the charge on the surrounding electric field travels at the speed of light. This is why depending on the distance from that oscillating charge, there is a delay in how the electric field changes. In other words, you also get a sine curve for light when the x axis is position.

[@narniabusiness7810]

Awesome video as always!

[@jehanzaibiqbalkhan5319]

Intelligently explaining the concept of EM. I have one question: Do EM waves we generate have mass and are EM waves use air particles as medium when they are transmitted from the source to the destination?? Thanks!

[@PhysicsMadeEasy]

Hi Jehan, Within a classical physics context, EM waves are the propagation of an electric field fluctuation . No information can travel faster than the speed of light, so the speed is that of light. As the speed of an EM wave can be measured as being that of light, it cannot have any mass, but it does visualize the transport of energy (so according to General relativity, spacetime will be affected by the EM wave, the same way mass does) Because of the delay due to the limited speed of propagation of information, the oscillations of the charged source ends up with the shape of a wave propagating from the source. In other words, it is not something that is material, and therefore does not need a material medium (like air particle) to propagate.

[@JohnJohn-dc7id]

Informative video

[@BhathiyaFernando]

Thank You for this easy to understand explanation..

[@abhisheknagar5909]

Great explanation

[@shauntl2770]

THANK YOU SO MUCH I HAVE BEEN HAVING A HARD UNDERSTANDING THIS AND YOU CLEARED IT UP THANK YOU!!!!🙏🙏

[@Md_Tariqul]

I understand the very first and fundamentals of electromegnetic wave..

[@MrSolainathan]

well explained. Science shall be made easy

[@PhysicsMadeEasy]

... because approached / explained the right way, it is!

[@somarajanrajesh4086]

What a video sir. Fantastic.

[@PhysicsMadeEasy]

Thank you Rajesh!

[@smallmoe2931]

Thank you for the explanation, sir. Definitely sharing this video and channel with my friend.

[@PhysicsMadeEasy]

Hi Moe, I am glad you enjoyed it and that it was useful to you!

[@indudevi4479]

This by far best explanation about EMW. Thank you for it...would you name that progressive music in the outro ..??

[@PhysicsMadeEasy]

You are welcome. About the music, I actually have two hats... I am a physics teacher but also a music producer, so I just pick in my own catalogue for video music backgrounds. You can hear it on the site of one of my editors if you are curious. (www.audiosparx.com/sa/summary/play.cfm/crumb.2/crumc.0/sound_iid.933939).

[@aibasonbhuyan3512]

Thank you sir short and sweet

[@indivitrongaming]

REALLY LIKED THIS EPIC EXPLAINATION SIR. LOVE FROM INDIA❤️

[@jaihind9281]

Your channel is worth 1 billion subscriptions.

[@PhysicsMadeEasy]

A billion? That's 1 person out of 7 in the world... haha! If 1 person our of 7 would be the kind to enjoy physics (= making efforts to understand how nature and our universe works), the world would be a much more peaceful place :-)

[@siddhartharajputsingh]

As a electric engineer .....i subscribed ....

[@PhysicsMadeEasy]

Thank you, the fact that a peer scientist enjoys my content is much appreciated!

[@gkb1702]

Thank you sir.

[@arpit02]

You literally made it easy 🌀

[@PhysicsMadeEasy]

Thank you for letting me know that my channel is reaching its goal :-)

[@bandaruramana2119]

Awesome explanation sir clearly I understood how long frequencies will radiate through the space can you please explain the what's the voltage of electrical supply will gives better radiation

[@PhysicsMadeEasy]

Hi Bandaru, if you want to understand better voltage, check out this video (what is an electric potential): kzbin.info/www/bejne/oGSqo4KBp8qSlZI In regards to this EM wave video, if you increase the AC voltage, the amplitude (thus the energy carried by the wave) will increase . Be well!

[@Paruthi.618]

Awesome explanation.👌 Thank you 🙏

[@PhysicsMadeEasy]

I am glad you enjoyed it Paruthi, Thank you for your kind words

[@nazmulhuda5145]

You are an amazing explainer.Keep doing such work that can help us.Thanks a lot for making.

[@PhysicsMadeEasy]

Hello Nazmul, thank you for your kind words. They encourage me!

[@nazmulhuda5145]

And u encourage me to learn more.

[@zuhaibakhtarkhan]

thanks ! sir first i was wondering for a lecture on electromagnetic waves like this but found nothing effective , when i saw your lecture i understood .

[@PhysicsMadeEasy]

Thank you Zuhaib! I am glad it helped you!

[@janhabipatra9177]

Great video sir 👏👏

[@hikhik2205]

Thank you for this information.

[@snigdhamohanty9228]

Got a clear picture of what em waves are! Thank you!

[@PhysicsMadeEasy]

You are welcome Snigdha, I am glad my work clarified this concept for you.