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Photon wavelength quantization?

  1. Aug 13, 2009 #1
    Are photon wavelengths quantizised? If so, what are their possible wavelengths? Do their possible wavelengths also depend on the system they are in?
  2. jcsd
  3. Aug 13, 2009 #2


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    No, they are not. The "wavelength" of a photon (which btw is a slightly ambigous measure) is not quantized. The usual "classical" relation between frequency and wavelength (lamba=c/f) applies even to single photons; quantum mechanics only adds the relation W=hf for the energy of a single photon.
  4. Aug 13, 2009 #3

    Jano L.

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    Wavelength of a free radiation is not restricted. However, stationary waves in optical resonators have wavelengths quantised. Consider stationary wave in long metal resonator of the length [tex]l[/tex]. It can have only such a wavelength, for which the condition

    l = n \frac{\lambda}{2}

    is satisfied for some whole integer [tex]n[/tex].
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