The equation E = pc is valid (a) for an electron as well as for a photon
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According to special theory or relativity the total energy of a particle is given by
E=√p^2c^2+m0^2c^4
Where p is the momentum, c is the speed of light in free space, m0 is the rest mass.
Now have E=pc, m0 (that is rest mass) must be zero. Which is valid for photon (rest mass of photon is zero).
But electron has finite rest mass.
E=√p^2c^2+m0^2c^4
Where p is the momentum, c is the speed of light in free space, m0 is the rest mass.
Now have E=pc, m0 (that is rest mass) must be zero. Which is valid for photon (rest mass of photon is zero).
But electron has finite rest mass.
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