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[Phys-l] Relativisitic mass vs Invariant mass



John Denker wrote:
The argument is actually quite clever. There is the particle, and there are the photons. The photons are of course ultra-relativistic, and have no mass of any kind.


Photon may have Debye mass, Meissner mass or "relativistic mass". (Depending on your political position) :-)
Feynman simply wrote that mass of photon is hf/c2.


Alphonsus