For some purposes a photon-a quantum of electromagnetic radiation-can be treated as a classical electromagnetic constant and w is the angular frequency of the wave. photons are circularly polarized. wave train with energy au = hw, where h is planck's reduced a. in einstein's mechanics the mass m ofa particle of energy e and momentum p is given by the relation e2p2m2 where c is the speed of light in vacuum. calculate the mass of the photon, defined in this way. b. the spin quantum number s of a particle is its spin angular momentum s divided by planck's reduced constant h. calculate the spin quantum number of the photon, thus defined