A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason both are false.
E) If assertion is false but reason is true.
Correct Answer: A
Solution :
When a light of single frequency falls on the electron of inner layer of metal, then this electron comes out of the metal surface after a large number of collisions with atoms of its upper layer.
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