Thread: E=mc2

Please comment on the following statement:

"As photon is in light, it has the highest velocity and according to law of conservation of energy, the relativistic mass is reducing towards zero [not exactly zero] to conserve the energy"

It is pretty much gibberish. Photons have no rest mass so the use of E=mc² in the thread title doesn't work, you have to use the full form of the equation which is:

E²=(mc²)² + (pc)²

where p is momentum which photons do​ have.

For photons, m=0 and E=pc...