Question

what is rest mass of photon

Answer 1

Actually what your science book says or is trying to say anyway,is that the photon's rest mass is zero. The concept of the rest mass derives from special relativity. The rest mass is the mass of a particle (in our case thephoton) as measured by an observer who sees the particle still and with zero speed.

Answer 2

Answer: zero(0) is the the rest mass of photon

Explanation: please mark as brainly