Photoelectric effect...

Photoelectric effect ; when light of certain frequency strikes the surface of a metal, electrons are ejected from the metal surface. This phenomena is called photoelectric effect. 

Cesium, which amongst the alkali metals has the lowest ionisation energy is metal from which electrons are ejected most easily by light. This metal is used in making electric cells. 

Observation regarding photoelectric effect are; 

1) for each metal, a certain minimum frequency of incident light is needed to eject electrons. This is known as threshold frequency. 

2) The no.of ejected electrons from metal surface depends upon the intensity of incident radiations.

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