What would be the best description of Einstein's explanation of the photoelectric effect?
a. Electrons have a definite mass.
b. Ejection of electrons occurs when the intensity of light increases beyond a certain minimum.
c. Light consists of "particles" with a definite mass.
d. Light consists of "particles" with a definite energy.
e. Ejection of electrons from certain metals occurs when the energy of an incident photon is greater than a certain minimum.