UPSC General Studies Sample Paper General Studies Sample Paper-9

  • question_answer
    When UV rays incident on the metal plate then photoelectric effect does not occur. It occurs by incidence of

    A)  X-rays             

    B)  microwaves         

    C)  infrared rays                 

    D)  radiowaves

    Correct Answer: C

    Solution :

    [c] Photoelectric emission is possible when \[v>{{v}_{0}},\] since v for X-rays is greater than that of ultraviolet light, hence photoelectric emission is possible by using X-rays.

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