Light Has Energy and (GASP!) Momentum | Doc Physics

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  • Опубликовано: 12 сен 2024
  • We derive radiation pressure and other cool stuff. Sail through the universe with ease.

Комментарии • 21

  • @JULALAINE
    @JULALAINE 3 года назад

    Wow! Light has energy and moment-um. We all have momentum.💛

  • @DocSchuster
    @DocSchuster  11 лет назад

    You're absolutely correct. In fact, gas pressure is explicitly potential energy density for a contained gas. Nice observation!

  • @sohamgumaste
    @sohamgumaste 9 лет назад +5

    Liked for the 'sqrrrr" :P

  • @ymmotyelkao6913
    @ymmotyelkao6913 Год назад

    So We put on knights suits ride horses with Gold shields

  • @stonebrother3751
    @stonebrother3751 6 лет назад

    5:10 killed me XD

  • @ashleelubben1822
    @ashleelubben1822 11 лет назад +1

    So can Pressure be equal to the energy density then? or am I missing some subtle averaging thing or something?

  • @americanborn6768
    @americanborn6768 5 лет назад

    10:08... yup, i feel ya; i'll cancel out sometimes, too.

  • @wesbaumguardner8829
    @wesbaumguardner8829 5 лет назад

    Light is a wave, which is an action of a medium; not a physical entity in and of itself. Thus it cannot have momentum. Ocean waves do not have momentum, the water has momentum. Water can have momentum even if waves are not propagating through it. It is the same with the ether.

  • @brockhuey3745
    @brockhuey3745 8 лет назад

    New to this. How does newtons law of recoil come into play when the photons emitted by the sun have no mass. Also in order to understand I do not see how something with no mass can have momentum. Why do photons travel the speed that they do. Is this the fusion process responsible for the transfer of energy to the photon or is it merely emitted and attaining that speed with no corresponding input. Does light have the affect of crushing the source of the photon with the opposite amount of force of its departure momentum? If every action has an equal and opposite reaction then photons must produce recoil when they are emitted, correct? If that is true then please explain the reaction on the source of the photon. If there is no equal, opposite, reaction is it because the photon is massless?

  • @AshokKumar-rr1zw
    @AshokKumar-rr1zw 6 лет назад

    Doc but in simple harmonic oscillator the energy exchanges, the KE converts to PE, but in the EM waves the both electric and magnetic energy maximize and minimize at the same time. So I don't think they could be compared to Simple Harmonic oscillator..P.S. No offence..I've always admired your knowledge.

    • @DocSchuster
      @DocSchuster  6 лет назад +1

      None taken! Have you studied what is unfortunately called the "retarded potential" in E and M? I think they will help you understand why I feel that it's still SHM. But I agree that their coinciding maxima was a stumbling block for me for a while.

  • @MelangeToastCrunch
    @MelangeToastCrunch 7 лет назад

    Doesn't anything that exerts a force have momentum? Newton's third and second law state in conjunction that, in a closed system, the momentum of that system doesn't change, due to forces acting in equal and opposite pairs.

    • @DocSchuster
      @DocSchuster  7 лет назад

      Fields exert all forces. Have you studied the Poynting Vector?

  • @STARDRIVE
    @STARDRIVE 7 лет назад

    I'm sure you're a busy man, mr. Schuster. But if you like a Newtonian model of the photon look no further. Search VEDODER , flight of the photon. My calculations are very basic, and checked by my local university.
    It even proves photons and quarks share the same building block. I shit you not.

  • @rogeronslow1498
    @rogeronslow1498 8 лет назад +1

    Fascinating subject but too much hand waving and not enough rigour.

  • @emmanuelrakhutsi2807
    @emmanuelrakhutsi2807 4 года назад

    I hate colours