Thermonic emission occurs in
A. Vacuum tubes
B. Copper conductors
C. Ferrite cores
D. Transistors
Answer: Option A
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Thermionic emission (archaically known as the Edison effect) is the flow of charged particles called thermions from a charged metal or a charged metal oxide surface, caused by thermal vibrational energy overcoming the electrostatic forces holding electrons to the surface.
The gas particles become ions as a result of this collision and are pulled to a biased plate. ... Thermionic emission occurs when a metal is heated to a point that electrons are shaken from the surface of the metal.