Question

the process which electrons are emitted by a hot metal surface is known as​

Answer 1

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Thermal energy given to the charge carriers overcome the work function of the metal and thus flow of charge carriers takes place from the metal surface. So, process of the emission of electrons from the hot metal surface is called as thermionic emission.

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Answer 2

Answer:

$\red{Thermionic ㅤEmission}$ㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤ