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NEET 2002
Exam
NEET
Year
2002
Subject
Physics
Chapter
Dual Nature of Matter

NEET 2002 · Physics · Dual Nature of Matter

When ultraviolet rays incident on metal plate then the...

When ultraviolet rays incident on metal plate then the photoelectric effect does not occur, it occurs by incidence of:

Options

  1. Ainfrared rays
  2. BX-rays
  3. Cradio wave
  4. Dlight wave

Correct answer

B. X-rays

Step-by-step 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.
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