PHYS 101/102 #1: Electromagnetic Waves

Sparks fly-literally-as CU physicist Bob Richardson lectures on the propagation of electromagnetic radiation (1981)

[@bjbbshaw]

Very stimulating to see the demos at a very human level rather than as diagrams in a book.

[@fukgovernment]

My uni profs comes with a laptop and read all the bullshit inside. This is just so cool with demo, and it makes understanding much easier

[@mybluemars]

Beautiful demonstration of Electromagnetic Waves!

[@OtterLakeFlutes]

This is fantastic. Every time you try to ask a ham radio forum about something like many useful concepts in this, your question is over their heads so high they think your question doesn't make sense and you must be doing or thinking something incorrectly. Then you'll get an educated one (the minority of outspoken individuals) but he's likely to do a a whirling dervish dance around the answer trying to make it intangible or illusive like a doughnut hole. By the time he's done beating around the bush, he's forgotten what point his anticlimactic crescendo was ever supposed to amount to. I get answers faster watching entire lectures like this one!

[@Yellowflop]

ironic

[@Ekksse]

r/iamverysmart

[@Xscott1000]

Loved watching the use of those grand old devices - great video thanks for uploading.

[@ahmadahere]

These physics videos are epic! I love the simplicity and the classic demonstration tools.

[@1981Yassa]

Great and fun demonstration ! Well done !

[@faizanzahid490]

This is rather more amazing some one making you visualize the theories. I'm unable to put my remarks into words for such great explanation.

[@orozcoapaza1660]

I really enjoy learning, thanks for sharing knowledge Cornell University.

[@meyou9655]

I'm just finding this great presentation now. I've been missing out.

[@kj6bbs]

Thank you so much for this great explanation of EM waves.

[@TheZooman22]

Nice demonstration... The use of the various devices clearly demonstrates the concepts and make it easy to internalize the theory.

[@1979Guts]

this was excellent, i enjoyed it immensely. It would be great if cornell could do a more current version of this

[@seshansesha7645]

Thank you for the excellent demonstration....

[@obiwan042]

3 people not only do not understand physics but lack the desire to learn more as well as the appreciation for physics and the beauty of the universe.

[@jimpsky]

Good vid. Bob Richardson, Nobel Prize in Physics (1996).

[@fabienpaillusson7390]

Fantastic lectures!!

[@solo2wolf]

Outstanding demonstration. Much missed in today's teaching methods I feel.

[@vishumishra0]

What a beautiful way of explaining the concept . Heads off to you. And yes what happened with that electromagnetic wave you carried with yourself .

[@radiofun232]

Best demo on You Tube about these phenomenon.

[@KevinAshcraft]

Cool Cornell University video from 1981 demonstrating how radio works. Perfect foundation information! #hamradio

[@Sixalienasa]

Very cool, I love the Early Days look of the junk involved. Great, really gets the mind open and working.

[@wouldntyouliketoknowweathe4581]

The Corona discharge. 2020: 👀👀👀

[@gowthamuknown]

Oh oh

[@Freerangeart]

this was so great, really helped me to understand

[@CLoak183]

So, has this video inspired you to get your ham license yet?

[@DDDelgado]

Nice demo, i love it

[@KumarVibhav]

Why didn't I have teachers like Him ?!

[@MrUnder30seconds]

i had a women science teacher ): she taught me how to say "you are a fat greasy gay" in spanish. tu eres una gorda gresa madicon.

[@edakhi]

It's fantastic to realize how diference is the education between first world and third world.. in my case never saw all this, 1981 now 2012 it's fantastic... Soy de Ecuador

[@mohammedmutair1825]

ي

[@007MrYang]

Im 17 and this is fascinating. Can't wait to actually learn it!

[@CLoak183]

Dude. Have you got your ham radio license yet?

[@MrKorrazonCold]

Yes I believe Q.A.T is correct. Matter is violent motion simulating rest and balance now through violent motion. The locational spherical inward absorption and outward emission of EM-Waves must be forming all forces of nature, antimatter matter annihilation forming + and - electric charge and EM-fields and the forward passage of time. The more violent the motion the greater the illusion of rest energy or mass the greater the absorption and emission rate the slower time runs within that ref-frame

[@h2opower]

Nice example of Standing waves with the red light showing the anti nodes.

[@ntomata0002]

It is the same as like the coupling between the antennas. When the conductors (transmiter & receiver) are parallel you have maximum absorbion.

[@Migueldeservantes]

I use a 5.8 Ghz transmitter and receiver! I fabricate new and more efficient antennas! Do you have any advice of what procedure of how to measure that output and specially the gain of different antennas? thanks in advance!

[@FVInLPS]

that has actually been really good for people that study in countries that don't invest in props, such as mine ( i live in Dominican Republic), if it wasn't for power point we wouldn't be able to see things like this in some of my classes.

[@professorbhaiyyamotivation]

where can i find more of these videos link plz someone?

[@shirleyjtni]

Thank you very much!

[@DukeLaCrosse20]

The whole time he was handling all those tubes and (what appear to be) antique devices I was worried he was going to drop/break something. The ending of the first part was classic!

[@MrKorrazonCold]

That makes perfect sense to me. Thanks! "Could all direction be curved multiplying+/-dividing 3-D spherical waves inbetween an infinite number of vorticies? And there is no space, or rather matter is just space when and where it is very intense in violent motion simulating rest and balance now through violent motion. These opposing vorticies spiralling outward seem to combine together and we have the Fibonacci sequence in objects of broken symmetry that can be seen almost everywhere in nature."

[@shirleyjtni]

Can someone explain to me why the E-field can pass through the wire grid that's perpendicular to the E-field polarization? Thanks!

[@daddy7973]

Nice demo.

[@topspeederalmond]

Very nice. I have not thought or heard about galvinometers in a long time. Thank You

[@sudhansumtripathy]

Hi sir need the complete video lecture on the Electrical Physics, I would like to know at what frequency will a human being get electric shock and in an Induction motor do we get electric shoch if we touch the rotor. Please provide a lecture series on the tesla coil, antenna fundamentals and design of antenna and Electrical Machines

[@omalrafa]

this video is great!

[@Differendramovies]

So great

[@jaderoov]

very beautiful and attractive way of explaintion

[@jasonsweet228]

what happens if you have a magnet core coil and you run electricity through the coil? Does it super-amplify the EMF field or shoot the magnet out of the coil like a bullet?

[@iloveflyingac]

hello, i have a Q if you can answer.. can we destroy or absorb the electromagnetic wave 10µ. or may be can we change its frequency or wavelength after it is transmitted on the way ??? please answer me...........

[@SANDALKOTAWALABEE]

Really amazing! Hats off to u Prof :)

[@jazbinsek]

Great video! Great Lecture!

[@lifecolor]

25:20 = silly and lol. I did quite a few of these experiments in my Conceptuals Physics class. Thanks.

[@UnknownSoul001]

@iloveflyingac We can absorb the electromegnatic wave & change its shape but energy cannot be destroyed. EM wave is also form of energy. We can change its frequency by several ways. One femous natural phenomenon of change in frequency is "Doppler's Effect".

[@TheStarryboy]

awesome stuff. My professor recommended it to me :)

[@MrKorrazonCold]

'Space is a division of solidity into tenuity. Also a multiplication oscillating volume at expense of gravitational potential. Now matter in violent motion is simulating rest and balance through violent motion. In the future Heisenberg's limit will be required time cycle for quanta to exist. The interval of the becoming moment reaching its threshold when C is cancelled out by its anti+C, collasping and reforming+/-eXploding into this enomous collage of what we experience as the current moment.

[@subbu2346]

Thank u

[@salmonxia]

where are rest of lectures?

[@davereid-daly2205]

Briliant ! Really enjoyed the humor. Where were you when I was at school. Too many theory based teachers out there, these demonstrations really helped me, thank you soooo much...great work !!

[@axelbelleris]

Espero tener la suerte de emcontrar un profesor como éste, que explique así, demostrando cada fenómeno con experimentos. Qué apasionante. ¡Muchas Gracias por compartir!

[@peterbonnema8913]

The very best part: 25:20 I laughed out loud XD

[@moshcustom]

Did he really fall?

[@a.j.o.manalansan3282]

I did not expect that coming, LoL.

[@josephma9037]

hahaha

[@alexpeek8760]

amazing!

[@PhilthCollinz]

Im fuckin crying!🤣🤣🤣😭😭😭😭😭

[@Dyslexic-Artist-Theory-on-Time]

Motion within an infinite number of ref-frames, based on just one equation (E=ˠ M˳C² )∞ the Lorentz contraction of space and time is between the energy and mass. The greater the energy the greater the contraction of space and the slower time will run. Mass will increase relative to this and each ref-frame can be seen as a vortex in space formed by the rate that time flows. The brackets represent the boundary condition of the ref-frame formed by the energy within infinity

[@Concienciafractal]

Pido al que pueda que haga la traducción o el subtitulado en Español. Gracias!

[@omibuddyy]

I am surprised that the camera is still working!

[@jayejayeee]

some sweet info here

[@ICEGTN]

Dipole antenna: what I don't understand is how can a magnetic field be generated if the circuit is open... because open circuit = no flow of electrons... -> confusion

[@tomshaa391]

What kind of wave in the vacuum, how explaine TEM, phase ondulation of stationnary scalar wave space/time ... gabriel LAFRENIERE tell more about scalar field ...

[@TuscaniManiac]

gr8 vid thx !

[@CondensedComments]

3:01 There's a leyden jar, spark gap and voltage source, it's said the spark gap breaks down and you get ac voltage. How is the voltage alternating directions?

[@TheSundaysLive]

The leyden jar and the spark gap create a pulsing current in the coil this gives a pulsing magnetic flux over the coil. When the flux is decreasing a potential difference over the coil is created which is opposite when the flux is increasing. This is called inductance and is responsible for the ac component.

[@hemsj02]

where is the second vid man ??????????????

[@sifisoradebe2471]

thanks a lot

[@Afeqs]

I wonder if the multiple bulbs were connected in series or parallel.

[@JawwadHussainBhattti]

Awesome i like it...

[@GeneralBB3]

So Cool

[@taojiang719]

we can actually see induced noise on the tape recorded. once professor turned it off, it disappear. 5:16

[@stabiljka]

Tao Jiang I could see them on me telly

[@h2energynow]

Awesome

[@mplaw77]

Well done, interesting

[@ytrew9717]

which pixel is talking?

[@captkirkconnell]

That's a Pass Professor. A+ Quality OK to distribute to Innovators.

[@MrKorrazonCold]

And when an object accelerates towards the speed of light away from an observer becoming redshifted. And Blueshifted in front of the object compressing the wave-amplitude the shorter the wavelengths this will increase the circular momentum of the waves and the gravitational force!

[@Tom-pc7lb]

At about the 15 minute mark, is that the HARP free energy experiment?

[@schmetterling4477]

No. :-)

[@MrKorrazonCold]

"Physics is easy! There are only two combinations of these spherical sine wave-front's. They have opposite vector's and spin forming the positron resonance input+0/1-output electron wave-front's concentrically layered like onion's compressing+4-0-4+decompressing eXpanding sphere's dissipating gravity dividing time symmetry, at the same ratio, information is being multiplied by surrounding masses generating electrical potential oscillating volume of mass at the expense of gravitational potential.

[@Dyslexic-Artist-Theory-on-Time]

Good video! This is an invitation to see an artist theory on the physics of light and time! Based on just two postulates 1. Is that the quantum wave particle function Ψ or probability function represents the forward passage of time itself quanta by quanta! 2. Is that Heisenberg’s Uncertainty Principle ∆×∆p×≥h/4π that is formed by the w-function is the same uncertainty we have with any future event within our own ref-frame that we can interact with turning the possible into the actual!

[@rickwest2818]

How to the magnetic field and electric field get in phase when they come off the antenna 90 degrees out of phase?

[@schmetterling4477]

That's what Maxwell's equations are telling you.

[@rickwest2818]

@@schmetterling4477 I found the answer to my question. Equations are great for predictions but they don't always grant a mental image of what's really happening.

[@schmetterling4477]

@@rickwest2818 No, but you can develop the mental images by reducing the equation to what is happening in each point. How does a changing magnetic field cause an electric field? How does a changing electric field cause a magnetic field? When are they both in equilibrium? You can do this graphically if it helps or you can evaluate it mathematically. Having said that, it takes a good amount of time to develop an intuition and I have to say that mine was never very good for the free em fields.

[@ikaeksen]

25:23 No animals made out of glass was hurt in this video.

[@Tulay-uyma]

videolarınıza türkçe altyazi eklermisiniz lütfen❤ bilgi için teşekkürler💎

[@adriangheorghe2327]

Asa zisele unde electromagnetice UE exista doar in conductori. In vidul cosmic, materializat de oceanul eteric, necoeziv, neinertial, inelastic si incompresibil, adica in oceanul materiei inponderale, nu poate functiona mecanismul undelor, care cere transformarea succesiva a unei forme de energie in alta forma. Sinfazarea campului electric cu cel magnetic in sanul undelor EM este dovada clara ca in vid mecanismul undelor nu functioneaza. Undele asa zis electromagnetice sunt doar niste reliefuri electromagnetice, constituite din circulatiile inlantuite ale campurilor elec tric si magnetic. Dupa descifrarea sensului fizic al constantei de actiune h se poate demonstra ca la nivelul fiecarei semiunde, forta electromagnetica propulsoare, este la echilibru cu forta de inertie, (BIl=m.a). Acest echilibru, face lunecarea (translatia) cu viteza uniform rectilinie, a structurii scalariforme a undei electromagnetice. Viteza uniform-rectilinie si structura periodica transverasala, dau aspectul de unda al radiatiei E-M. Dar radiatia E-M este doar o structura dinamica similara motorului electric liniar, care luneca prin vid cu viteza luminii, fiind propulsat de forta electromagnetica, forta care este la echilibru cu forta de inertie. The so-called UE electromagnetic waves exist only in conductors. In the cosmic vacuum, materialized by the etheric, non-cohesive, non-inertial, inelastic and incompressible ocean, i.e. in the ocean of weightless matter, the wave mechanism, which requires the successive transformation of one form of energy into another, cannot function. The phasing of the electric field with the magnetic field in the breast of EM waves is clear evidence that the wave mechanism does not work in a vacuum. The so-called electromagnetic waves are just some electromagnetic reliefs, made up of the chained circulations of the electric and magnetic fields. After deciphering the physical meaning of the action constant h, it can be demonstrated that at the level of each half-wave, the propulsive electromagnetic force is in balance with the inertial force, (BIl=m.a). This balance makes the sliding (translation) with a uniform rectilinear speed, of the scalar structure of the electromagnetic wave. The uniform-rectilinear speed and the transversal periodic structure give the wave appearance of E-M radiation. But the E-M radiation is only a dynamic structure similar to the linear electric motor, which glides through the vacuum at the speed of light, being propelled by the electromagnetic force, the force which is in balance with the inertia force.

[@ferdyhoshigakitube]

10:09, This Dude endure pain just to show us how Electromagnetic Wave works, Respect for you good Sir, repect for you

[@davishasanai8526]

Props to him .

[@Dyslexic-Artist-Theory-on-Time]

In this theory objects form their own time by slowing up the rate that time flows relative to their own energy or momentum. This is a process is universal from the largest planet to the smallest creature everything will form its future spacetime geometry by slowing up the rate that time flows relative to its own energy. This can be best seen in plant life in the form of the Fibonacci spiral being visible in almost every type of plant life

[@Tricky1341]

so in other words this video demonstrated that electricity and light could of been free to all

[@nRADRUS]

once more, but with quantum explanation pls )

[@atheistaetherist2747]

Skoolkids are not told that radio waves (ie em waves) are a different animal to photons. A 10 mm radio wave is not the same animal as a 10 mm photon. Radio waves consist of my photaenos which are the radiating part of a photon. And, re the Hertzian rolling E by H nature of radiating emissions from photons, i like the work of Ionel Dinu who has analysed the Hertz experiment & he says that Hertz's interpretation of Hertz's waves was wrong, there is no rolling E by H emission. Likewise Ivor Catt says that there is no rolling E by H emission anywhere in nature, it is a Heaviside slab of E by H energy current, a TEM. The so-called flow of so-called electrons in an antenna or in any wire is a secondary effect. There is a slab of transverse E by H energy current flowing along the outside of the antenna/wire. As explained by Heaviside, Ivor Catt & Forrest Bishop. There is no such thing as charge or voltage. Photons have a central/internal part (the central helix) & an external part (the photaeno). The central helix has a front end & a rear end, & is (possibly) 1 wavelength long. The wavelength is simply one turn of the helix (there is no wave). The central helix is an annihilation of aether. Annihilation of aether gives gravitational mass & inertial mass. The track of the annihilation forms a helix. The helical annihilation moves axially throo the aether at the speed of light c, & along its helical track at more than c. Photaenos radiate out (to infinity) from the central helix. Photaenos annihilate aether, hence they have gravitational mass & inertial mass. Photaenos include a vibration (excitation) of the aether. Photaenos propagate outwards throo the aether at perhaps 5c in the near field & perhaps c in the far field. Photaenos radiate from fixed locations in the aether, ie from fixed locations along the central helix. Photaenos do not have a sideways velocity in the aether, ie each photaeno is shed from the central helix as the rear end of the central helix passes. In a free photon every photaeno is initially attached to the central helix, & later it detaches. In a confined photon the central helix has formed a continuous loop, in which case the photaenos do not detach (the central helix has no rear end). Electrons & other elementary particle are confined photons. Photaenos give us charge fields & electromagnetic fields. An attached photaeno gives a high field strength, an unattached photaeno gives a weaker field. Hence a free photon has 3 parts, the central helix, the attached photaenos, & the unattached photaenos. A confined photon has 2 parts, it has no unattached photaenos. Man-made radio signals are carried by photaenos, they are not carried by photons. A photon with a (natural) 10 mm wavelength (the length of its central helix), is a different animal to a radio wave with a (forced) 10 mm wavelength (which has no central helix). Free photons are slowed by the nearness of mass (confined photons), as suggested/proven by Shapiro (Shapiro Delay). Shapiro Delay is due to the photaenos (from the free photon)(& from the confined photon) fighting for the limited use of the aether. Fighting/congestion slows the photaenos & this slowing feeds back to the central helix, slowing the central helix. I call this slowing "photaeno drag". It contributes to the bending of light. It gives us diffraction near an edge. Photaeno drag is very strong inside mass (air water glass). It gives us refraction, & reflexion.

[@schmetterling4477]

Wow, that was some good horse manure. ;-)

[@JoeWilger]

25:15 to 25:30 - I think they used Foley sound...

[@suhaimiseliman8593]

The TRANSMITTER 'S power is sufficient to accommodate the minimum signal requirement for all receiver ( coil/loop ) placed along HORIZONTALLY position glass rod. Red neon bulb lit with same brightness. 🤔😷

[@suhaimiseliman8593]

When placed near the coil.

[@suhaimiseliman8593]

ELECTRIC FIELD.... CAUSED NEON TO BREAKDOWN 🤔😷

[@airtechmedia]

You can see the electromagnetic interference slowly moving up in the each frame of the film as soon as he switches it on.

[@DHARMENDRAGUPTA-or6zw]

too much darkness in whole video u cant see anything vividly

[@madhumitha901]

too good in 240p

[@MrUnder30seconds]

no returns

[@josephma9037]

@FirstEastern Perspective ah

[@ronaldsykes966]

nice,now lets step it up a bit,ok.the direct interaction with the plasma field with the specific interaction of metals from the carbon group,run threw reverse back to back thyristors threw a dual high voltage signal generator ,threw a secondary ionized gas field ,threw an inductor, 1 to 1, into a sound generator circuit so you can hear what you sound like interacting with the plasmas field threw a speaker. lol have fun take care ron

[@jamesof7seven]

if I could understand this, I wouldn't need this

[@Dr.HazharGhaderi]

25:22 haha so good :)

[@schitlipz]

Nice gizmos. Can never find a good explanation of the transition of near field to far field.

[@Peewee0413]

I think his flow direction is backwards

[@engmahdi1418]

Can't wait #2 please release it as soon as possible 🙆

[@cksmaya]

很棒的示範教學，我從沒看過這樣認真教學，謝謝你。

[@zachtgreen]

13:20 he changes the potential in his rod.