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How Can They Be Made to Leave the Metal Surface? (State Any Two Ways) - Physics

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Question

How can they be made to leave the metal surface? (State any two ways)

Solution

Electron emission from the metal surface can be (any two):

1) Thermionic emission – when energy is supplied as heat

2) Photoelectric emission – when energy is supplied as energy.

3) Field emission – when energy is supplied by applying an electric field to accelerate the electrons.

4) Secondary emission – when energy is supplied from the kinetic energy of other electrons on collisions with them.

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