1.

How do you justify that the rest mass of photons in zero ?

Answer»

Solution :The MASS of a body moving with speed v
m =`m_0/sqrt(1-v^2/C^2)`
Rest mass, `m_0 = m Sqrt(1 - c^2/v^2)`
For a photon, v = c, THEREFORE `m_0 = m sqrt(1 - C^2/v^2)` = ZERO.


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