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• Topic:

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If the momentum of a photon is p, then its frequency is

(a) $\frac{\mathrm{ph}}{\mathrm{c}}$           (b) $\frac{\mathrm{pc}}{\mathrm{h}}$

(c) $\frac{\mathrm{mh}}{\mathrm{c}}$           (d) $\frac{\mathrm{mc}}{\mathrm{h}}$

where m is the rest mass of the photon