Question

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

• A. Increases
• B. Decreases
• C. Remains constant
• D. None

Answer 1

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.