If it is not always c, then λf=c would be incorrect, and it should be λf=v_p like matter waves, right?
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If it is not always c, then λf=c would be incorrect, and it should be λf=v_p like matter waves, right?
The photon's velocity is always c. Electromagnetic waves are also used in situations where they are not the eigenfunctions of single photons.
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