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B More photon questions

  1. Aug 2, 2016 #1


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    [Moved from https://www.physicsforums.com/threads/if-a-photon-were-trapped-between-two-perfect-mirrors.880490/ because it's a different question]

    Hi, ed. Could you explain what you mean by interference between photons? Is there a wavelength smaller than 0.1nm for EM radiation?
    Last edited by a moderator: Aug 2, 2016
  2. jcsd
  3. Aug 2, 2016 #2


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    What is interference between photons? - If you shoot a second stream of 630nm photons, you see wave like interference patterns that suggest something periodic of that size. Some photons reinforce other photons and it looks bright. Some photons interfere with other photons and you cant see anything at all.

    Smaller size? - sure you can start with a smaller wavelength photon. But smaller wavelength means higher energy. If you get small enough, the photon will have enough energy to blast itself right through the wall.

    Also dont forget that you cannot "squeeze" photons to make them smaller. Photons either crash into something where they disappear and transfer their energy to a molecule; or certain crystals can split them in 2, but produce two photons at 1/2 the energy and twice the wavelength (bigger).
  4. Aug 3, 2016 #3


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    EM waves interfere with each other, not photons.
  5. Aug 3, 2016 #4
    X-rays typically have wavelengths in the range of 0.01-10 nm. Gamma rays are usually below 0.01nm, but the distinction between the two is usually given by the source of the radiation, not on the wavelength.
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