Work function of a metal is

Minimum amount of energy required to start emission of electrons from the inside of the metal

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Minimum amount of energy required to start emission of electrons from the surface of the metal

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Maximum amount of energy required to start emission of electrons from the inside of the metal

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Maximum amount of energy required to start emission of electrons from the surface of the metal

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The correct option is B
Minimum amount of energy required to start emission of electrons from the surface of the metal

Work function of a metal is the minimum amount of energy required to start emission of electrons from the surface of the metal.

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The minimum amount of heat energy required to emit an electron from a metal surface is called

4.95 \times 10^{- 19}

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