PHOTOELECTRIC EFFECT

When light of sufficiently small wavelength is incident on a metal surface,electrons are ejected from the metal,this phenomena is called photoelectric effect.the electrons ejected from the surface of the metal are called photons.there are large no. Of free electrons present in a metal but they are not free to leave the surface of the metal.so a minimum amount of energy i.e. Work function must be given to a electron so as to bring it out of the metal.when a light is incident on a metal surface,the photons collide with the free electrons.in a particualar collison the photon may transfer all its energy to the electron.if this energy is more than the work function the electron may come out of the surface of the electron.and this electron wil have a kinetic energy equal to (energy - work function) or less than it, but it will be never greater than that.
in a particular collison it can also happen that even after getting more energy than the work function the elect. May not come out.
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