Q137. What is the rest mass of a photon, a particle that travels at the speed of light?Physics — NUST Mock By Dogers 4 — Question 137 of 200A. Equal to the mass of an electronB. Equal to the mass of a protonC. ZeroD. Dependent on its energyPractice more Physics MCQs for entrance exam preparation on Examora.io.← Previous Question Next Question →