A) photoelectric effect
B) thermionic effect
C) both (a) and (b)
D) none of the above
Correct Answer: C
Solution :
Thermionic emission is the flow of electrons from a metal caused by thermal vibrational energy overcoming the electrostatic forces holding electrons to the surface. While photoelectric effect is the emission of electrons from matter upon the absorption of electromagnetic radiation such as ultraviolet radiation or \[X-\]rays. Hence, emission of electrons is possible by both.
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