Question

mass of photon in motion

Answer 1

It has energy and energy is equivalent to mass. Photons are traditionally said to be massless. This is a figure of speech that physicists use to describe something about how a photon's particle-like properties are described by the language of special relativity.

Answer 2

Here, E is energy

c is speed of light in vaccum

v(nu) is frequency of incident light

h is planck's constant

m is mass