Question

what is the mass of a Photon?​

Answer 1

Explanation:

According to electromagnetic theory, the rest mass of photon in free space is zero and also photon has non-zero rest mass, as well as wavelength-dependent. The very recent experiment revealed its non-zero value as 10 - 54 kg ( 5.610 × 10 - 25 MeV c - 2 ) .