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What is photelectric effect ? Define (i...

What is photelectric effect ? Define (i) Stopping potential (ii) Photoelectric work function.

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Photoelectric effect : The phnomenon of emission of electron by cetain substance (metal) when it is exposed to ratiation of suitable frequency is called photelectric effect.
(i) Stopping potential : the minimum negative potential given to the plate for which photoelectric current stops flowing is, called cut off or stopping potential.
(ii) Photoelectric work function : The minimum energy required to just remove an electron from the surface of a certain metal is called photoelectric work function.
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