Originally posted by manfermef:
I dont agree so easilyi with Johnny argument:
"E=mc2 does not apply to a photon because a photon do not have potential rest energy; it only has kinetic energy given by Planck's relationship"
I think that E=mc2 implies or predicts that no one
particle in the Nature could be massless. Because his energy would be 0, and how to move in with E=0. Isn't impossible?
This is the nice thing in life; or rather should be the nice thing in life: We can agree to disagree and argue about it, hopefully politely. I have difficulty to follow why E=mc2 must mean that every particle has mass.
If you write down the energy equation derived by Einstein you will find that a photon must have zero mass in order to have the momentum E/c which, within experimental accuracy,it has. experimentally has.
