Question 2
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Thermionic emission occurs when the metal is _______________
- A Heated at very high temperature Correct
- B Heated at high temperature
- C Cooled at very low temperature
- D All of these
- E None of these
Correct Answer: Option A
The process by which free electrons are emitted from the surface of a metal when external heat energy is applied is called thermionic emission. Thermionic emission occurs in metals that are heated to a very high temperature.
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