In article ,
Bjoern Feuerbacher wrote:
newedana wrote:

[snip]

When deBroglei equation is applied to a photon( QM theorists defined
photon has zero mass,

Wrong, we did not "define" that, we determined that experimentally.

so they defined arbitrarily, E=pc,

Wrong, we did not define that, we derived that mathematically from the
general equation E^2 = p^2 c^2 + m^2 c^4.

Rather, that was another way to get to the same result known from
classical electromagnetism. Either way, a theoretical conclusion with
experimental validation, not a definition.


--
"I fart for joy and I laugh more than if I had cast my old age, as a
serpent does its skin." -- Aristophanes, Peace, 421 BC