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JAMB Physics 1992 Question 48

Question 48

Modern Physics

The threshold frequency for photoelectric effect depends on the

  1. A.intensity of incident light
  2. B.frequency of incident light
  3. C.material of the photocathode
  4. D.potential difference between the cathode and the anode.
Show the answer and explanation

Answer: C (material of the photocathode)

Explanation

Threshold frequency f0 = work function ÷ h, and the work function is a property of the metal (the photocathode material).