The mass of a photon with a wavelength equal to 1.54 x 10^{ -8} cm is:
(1) 0.8268 x 10 ^{-34} kg
(2) 1.287 x10^{ -33} kg
(3)1.4285x 10^{ -32}kg
(4) 1.8884 x 10 ^{-32} kg
ans: 1.4285x 10^{ -32}