The free electrons that are emitted from a metal surface, when heat energy is supplied are called _________ .

positrons

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thermions

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electrons

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photons

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Solution

The correct option is B thermions
The free electron emitted from the surface of the metal when external heat energy is supplied are called thermions and this process is called thermionic emission.

Thermionic emission occurs in metals that are heated to a very high temp.

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