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(C) Thermionic emission is the process by which electrons are emitted from the surface of a metal due to the absorption of thermal energy. When a meta

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High temperature

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(C) Thermionic emission is the process by which electrons are emitted from the surface of a metal due to the absorption of thermal energy. When a metal is heated to a high temperature,the free electrons within the metal gain sufficient kinetic energy to overcome the work function of the metal surface and escape into the surrounding space. Therefore,thermionic emission is caused by high temperature.

The thermionic emission of electrons is due to:

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