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Question

As temperature of the surface increases, rate of emission of electrons

A
Increases
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B
Decreases
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C
Remains constant
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D
None
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Solution

The correct option is A Increases
Emission of electrons from a heated source is called thermionic emission. This depends on the various factors like:
1. Nature of the metal.
2. Temperature of the metal.
3. Surface are of the metal.
Higher the temperature of the metal surface, higher is the emission of the thermions.

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