Question

Why does thermionic emission not take place in non-conductors?

Answer 1

Explanation:

Thermionic emission takes place from the surface of metal because its easy for the free electrons to escape from the metal surface then from inside the metal where the attractive force is more as compared to the metal surface.

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Answer 2

Thermionic emission not take place in non-conductors because nonconductor doesn't have free electrons.

Explanation:

• Material should also have low working function and sufficient amount of free electrons for thermionic emission.
• Nevertheless, nonconductor doesn't have free electrons, so they have a higher feature of operating. So, in non-conductors, thermionic emission doesn't occur.

Thermionic emission:- The mechanism at which free particles are released from such a metal's surface while applying external heat energy is known thermionic emission. The thermionic emission exists in extremely high temperature heated metals.

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