Since QED treats photons as individual units (quanta) how does it treat the concept of the "wavelength" associated with the photon?
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There is a very real sense in which QED doesn't deal with this. Photons are excitations of the EM field with well defined particle-like properties in the theory and the wave-like behavior is a consequence of summing amplitudes over all coherent means of getting to the final result. – dmckee --- ex-moderator kitten Apr 28 '13 at 20:19
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Possible duplicate: http://physics.stackexchange.com/q/18563/2451 and links therein. – Qmechanic Apr 28 '13 at 21:19
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There is no reason to believe photons can't have a continuous spectrum of energy. Quantization of energy happen for bound systems like an electron around a nucleus. – Brandon Enright May 02 '13 at 20:26