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JAMB Physics 2013 Question 47

Question 47

Modern Physics

In photo-emission, the number of photoelectrons ejected per second depends on the

  1. A.frequency of the beam.
  2. B.work function of the metal.
  3. C.threshold frequency of the metal.
  4. D.intensity of the beam.
Show the answer and explanation

Answer: D (intensity of the beam.)

Explanation

Each photon can free one electron. A more intense beam carries more photons per second, so more photoelectrons are emitted per second.