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 due to thermal vibrational energy overcoming the electrostatiforces holding electrons to the surface. On the other hand Photoelectric effect is the emission of electrons from the matter upon the absorption of electromagnetic radiation such as ultravial or X-rays. Therefore emission of electron is possible by both.
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