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Oct5-09, 03:57 PM
P: 1,160
Photon equations are different from the Newton-like ones: there is no force term to accelerate a photon, etc. Its energy is calculated differently: hv. So speaking of photon mass is senseless. What we need to know is how photons are created and how they exchange the energy-momentum with matter. The theory of that does not contain any mass belonging to photon. Moreover, the relativistic relationship between the photon energy and momentum is valid only for m=0.