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What is the difference in amplitude between red and blue photons?

  1. Jul 21, 2005 #1
    What is the difference in amplitude between red and blue photons? Which has a great amplitude? Where is the definition of a photon's amplitude defined?
  2. jcsd
  3. Jul 21, 2005 #2
    Hello mcgucken,

    a photon does not have an amplitude, an amplitude for a photon is not defined (unless you mean the probability amplitude). The red and blue photon differ by their wavelength. For example a red photon [itex] \lambda = 800 [/itex]nm and blue photon [itex] \lambda = 400 [/itex]nm.

    When you talk about amplitudes you usually refer to electromagnetic waves amplitudes. But one single photon does not have an amplitude.
  4. Jul 22, 2005 #3

    Meir Achuz

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    A single photon does have an amplitude.
    The amplitude of the vector potential in an electromagnetic wave is
    given by Nh\nu, where N is the number of photons in the wave.
    Amplitude does not relate to color, which depends only on frequency (or wavelength).
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