According to Einstein's explanation, photoelectric effect occurs due to absorption of a single photon by an electron in the atom. When radiation falls on a metal surface, an electron may absorb one quantum of energy and increase its energy by . Some of the absorbed energy, W, will be used to separate the electron from the metal surface. The surplus energy appears as the kinetic energy of the emitted electron
. Some of the absorbed energy, W, will be used to separate the electron from the metal surface. The surplus energy appears as the kinetic energy of the emitted electron
