Einsteins photoelectric equation.

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Einstein explained photoelectric effect on the basis of planck's theory. It is the matter of common observation that electrons are emitted only when light is incident on the metal. Thus, the metal surface behaves like a potential barrier. So some energy require to cross the barrier. The minimum amount of energy required to come out from the surface of metals is called work function. Let Wo be the work function. An incident photon supplies whole of its energy hμ to the electron & the electron consumes some energy Wo against work function & comes out with the remaining energy as kinetic energy.
1/2 MV²max = hμ - hμ' This is the einsteins equation of photoelectric effect.

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