PHYS 101/102 #1: Electromagnetic Waves

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  • Опубліковано 11 чер 2024
  • Sparks fly-literally-as CU physicist Bob Richardson lectures on the propagation of electromagnetic radiation (1981)

КОМЕНТАРІ • 252

  • @bjbbshaw
    @bjbbshaw 9 років тому +21

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

  • @ahmadahere
    @ahmadahere 11 років тому +1

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

  • @Xscott1000
    @Xscott1000 6 років тому +1

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

  • @obiwan042
    @obiwan042 11 років тому

    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.

  • @fukgovernment
    @fukgovernment 10 років тому +4

    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
    @mybluemars 9 років тому +5

    Beautiful demonstration of Electromagnetic Waves!

  • @OtterLakeFlutes
    @OtterLakeFlutes 9 років тому +14

    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!

  • @faizanzahid490
    @faizanzahid490 5 років тому

    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.

  • @1981Yassa
    @1981Yassa 10 років тому +2

    Great and fun demonstration ! Well done !

  • @TheZooman22
    @TheZooman22 10 років тому

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

  • @seshansesha7645
    @seshansesha7645 4 роки тому

    Thank you for the excellent demonstration....

  • @meyou9655
    @meyou9655 3 роки тому

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

  • @orozcoapaza1660
    @orozcoapaza1660 6 років тому +3

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

  • @jimpsky
    @jimpsky 11 років тому +1

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

  • @kj6bbs
    @kj6bbs 14 років тому +1

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

  • @fabienpaillusson7390
    @fabienpaillusson7390 7 років тому +1

    Fantastic lectures!!

  • @1979Guts
    @1979Guts 14 років тому +1

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

  • @radiofun232
    @radiofun232 4 роки тому

    Best demo on You Tube about these phenomenon.

  • @Sixalienasa
    @Sixalienasa 12 років тому

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

  • @Freerangeart
    @Freerangeart 14 років тому +2

    this was so great, really helped me to understand

    • @CLoak183
      @CLoak183 3 роки тому

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

  • @vishumishra0
    @vishumishra0 8 років тому +4

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

  • @wouldntyouliketoknowweathe4581
    @wouldntyouliketoknowweathe4581 4 роки тому +15

    The Corona discharge.
    2020: 👀👀👀

  • @DDDelgado
    @DDDelgado 5 років тому

    Nice demo, i love it

  • @ntomata0002
    @ntomata0002 12 років тому

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

  • @solo2wolf
    @solo2wolf 14 років тому +15

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

  • @shirleyjtni
    @shirleyjtni 12 років тому

    Thank you very much!

  • @KevinAshcraft
    @KevinAshcraft 9 років тому +1

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

  • @007MrYang
    @007MrYang 13 років тому

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

    • @CLoak183
      @CLoak183 3 роки тому

      Dude. Have you got your ham radio license yet?

  • @Differendramovies
    @Differendramovies 4 роки тому

    So great

  • @omalrafa
    @omalrafa 12 років тому

    this video is great!

  • @SANDALKOTAWALABEE
    @SANDALKOTAWALABEE 8 років тому +1

    Really amazing!
    Hats off to u Prof :)

  • @KumarVibhav
    @KumarVibhav 10 років тому +6

    Why didn't I have teachers like Him ?!

    • @MrUnder30seconds
      @MrUnder30seconds 6 років тому +2

      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.

  • @daddy7973
    @daddy7973 4 роки тому

    Nice demo.

  • @jaderoov
    @jaderoov 8 років тому +1

    very beautiful and attractive way of explaintion

  • @MrKorrazonCold
    @MrKorrazonCold 11 років тому

    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

  • @jazbinsek
    @jazbinsek 8 років тому +1

    Great video! Great Lecture!

  • @edakhi
    @edakhi 11 років тому

    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

  • @topspeederalmond
    @topspeederalmond 8 років тому +1

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

  • @MrKorrazonCold
    @MrKorrazonCold 11 років тому

    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."

  • @h2opower
    @h2opower 12 років тому

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

  • @DukeLaCrosse20
    @DukeLaCrosse20 10 років тому

    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!

  • @FVInLPS
    @FVInLPS 11 років тому

    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.

  • @TheStarryboy
    @TheStarryboy 12 років тому

    awesome stuff. My professor recommended it to me :)

  • @cksmaya
    @cksmaya 6 років тому

    很棒的示範教學,我從沒看過這樣認真教學,謝謝你。

  • @shirleyjtni
    @shirleyjtni 12 років тому

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

  • @sudhansumtripathy
    @sudhansumtripathy 12 років тому

    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

  • @subbu2346
    @subbu2346 11 років тому +1

    Thank u

  • @Migueldeservantes
    @Migueldeservantes 11 років тому

    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!

  • @davereid-daly2205
    @davereid-daly2205 9 років тому +1

    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 !!

  • @sifisoradebe2471
    @sifisoradebe2471 11 років тому

    thanks a lot

  • @TuscaniManiac
    @TuscaniManiac 14 років тому

    gr8 vid thx !

  • @tomshaa391
    @tomshaa391 6 років тому

    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 ...

  • @UnknownSoul001
    @UnknownSoul001 13 років тому

    @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".

  • @MrKorrazonCold
    @MrKorrazonCold 11 років тому

    '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.

  • @jasonsweet228
    @jasonsweet228 11 років тому

    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?

  • @GeneralBB3
    @GeneralBB3 13 років тому

    So Cool

  • @h2energynow
    @h2energynow 5 років тому

    Awesome

  • @axelbelleris
    @axelbelleris 6 років тому

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

  • @professorbhaiyyamotivation
    @professorbhaiyyamotivation 6 років тому

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

  • @iloveflyingac
    @iloveflyingac 13 років тому

    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...........

  • @omibuddyy
    @omibuddyy 2 роки тому +1

    I am surprised that the camera is still working!

  • @Dyslexic-Artist-Theory-on-Time
    @Dyslexic-Artist-Theory-on-Time 11 років тому

    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

  • @lifecolor
    @lifecolor 13 років тому +1

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

  • @jayejayeee
    @jayejayeee 12 років тому

    some sweet info here

  • @CondensedComments
    @CondensedComments 5 років тому

    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
      @TheSundaysLive 5 років тому

      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.

  • @JawwadHussainBhattti
    @JawwadHussainBhattti 12 років тому

    Awesome i like it...

  • @mplaw77
    @mplaw77 7 років тому +2

    Well done, interesting

  • @captkirkconnell
    @captkirkconnell 12 років тому

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

  • @Afeqs
    @Afeqs 12 років тому

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

  • @Concienciafractal
    @Concienciafractal 12 років тому

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

  • @ICEGTN
    @ICEGTN 11 років тому

    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

  • @kumar-jj2dl
    @kumar-jj2dl 6 років тому

    This is what we r expecting such a nice video lecture.....

  • @engmahdi1418
    @engmahdi1418 6 років тому

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

  • @taojiang719
    @taojiang719 9 років тому

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

    • @stabiljka
      @stabiljka 9 років тому +1

      Tao Jiang I could see them on me telly

  • @Tom-pc7lb
    @Tom-pc7lb 2 роки тому

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

  • @JoeWilger
    @JoeWilger 9 років тому

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

  • @MrKorrazonCold
    @MrKorrazonCold 11 років тому

    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!

  • @Dyslexic-Artist-Theory-on-Time
    @Dyslexic-Artist-Theory-on-Time 11 років тому

    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

  • @peterbonnema8913
    @peterbonnema8913 9 років тому +30

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

  • @adriangheorghe2327
    @adriangheorghe2327 Рік тому

    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.

  • @Dyslexic-Artist-Theory-on-Time
    @Dyslexic-Artist-Theory-on-Time 11 років тому

    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!

  • @Tulay-uyma
    @Tulay-uyma 5 років тому

    videolarınıza türkçe altyazi eklermisiniz lütfen❤ bilgi için teşekkürler💎

  • @rickwest2818
    @rickwest2818 4 роки тому

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

    • @schmetterling4477
      @schmetterling4477 Рік тому

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

    • @rickwest2818
      @rickwest2818 Рік тому

      @@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
      @schmetterling4477 Рік тому

      @@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
    @ikaeksen 3 роки тому

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

  • @salmonxia
    @salmonxia 12 років тому

    where are rest of lectures?

  • @DHARMENDRAGUPTA-or6zw
    @DHARMENDRAGUPTA-or6zw 8 років тому +25

    too much darkness in whole video u cant see anything vividly

  • @MrKorrazonCold
    @MrKorrazonCold 11 років тому

    "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.

  • @schitlipz
    @schitlipz 7 років тому

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

  • @jamesof7seven
    @jamesof7seven 8 років тому

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

  • @hemsj02
    @hemsj02 11 років тому

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

  • @airtechmedia
    @airtechmedia 11 років тому

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

  • @nRADRUS
    @nRADRUS 9 років тому

    once more, but with quantum explanation pls )

  • @Tricky1341
    @Tricky1341 11 років тому +1

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

  • @zachtgreen
    @zachtgreen 12 років тому

    13:20 he changes the potential in his rod.

  • @marlonregalado1717
    @marlonregalado1717 4 роки тому

    Cool

  • @ytrew9717
    @ytrew9717 4 роки тому

    which pixel is talking?

  • @Dr.HazharGhaderi
    @Dr.HazharGhaderi 14 років тому +1

    25:22 haha so good :)

  • @seyedmarashi
    @seyedmarashi 6 років тому

    Welldone! your students are lucky with you...

  • @nafishsarwar2077
    @nafishsarwar2077 3 роки тому +3

    @10:00 Corona has lost all it's previous meaning, unfortunately.

  • @ferdyhoshigakitube
    @ferdyhoshigakitube 11 років тому

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