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The rest mass of photon is __________. (One, Zero, Infinite, None of these

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zero. m= m_0/?(1-v^2/c^2 ); m=kinetic or dynamic mass of photon (actually it is relativistic mass) and m_0 is rest mass. As for photon v=c so we end up finally with m_0=mx0=0. So the rest mass is zero.
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