When ultraviolet rays incident on metal plate then the photoelectric effect does not occur, it occurs by…
When ultraviolet rays incident on metal plate then the photoelectric effect does not occur, it occurs by incidence of:
infrared rays
X-rays
radio wave
light wave
Solution
When ultraviolet rays are incident on the metal plate and photoelectric effect does not occur, It means that the threshold frequency is greater than the frequency of ultra-violet rays. X-rays have extremely higher frequencies compared to that of ultra-violet rays. For photoelectric effect, the frequency of the incident light must be greater than the threshold frequency of the metal. Hence, when X-rays are incident, photoelectric emission happens. The correct option is B.