The minimum energy required for the electron emission from the metal surface can be supplied to the free electrons by which of the following physical processes? (a) Thermionic emission (b) Field emission (c) Photoelectric emission (d) All of these

The minimum energy required for the electron emission from the metal s

1.	The minimum energy required for the electron emission from the metal surface can be supplied to the free electrons by which of the following physical processes? (a) Thermionic emission (b) Field emission (c) Photoelectric emission (d) All of these
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The minimum energy required for the electron emission from the metal surface can be supplied to the free electrons by which of the following physical processes? (a) Thermionic emission (b) Field emission (c) Photoelectric emission (d) All of these

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