• # 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

[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.