Answer the following questions on thermionic emission. a. Define Thermionic Emission. b. Mention an application of Thermionic Emission. c. Name a substance that is a good thermionic emitter.

a. The emission of electrons when heat energy is supplied to a metal surface is known as thermionic emission.
b. Thermionic emission is used in cathode ray tube.
c. Tungsten is a good thermionic emitter.

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