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JAMB Physics 1987 Question 48

Question 48

Modern Physics

Which of the following statements is TRUE of photoelectric effect?

  1. A.It cannot occur in liquids
  2. B.The energy of the emitted electron is independent of the work function of the surface
  3. C.The energy of the emitted electron depends on the wavelength of the incident light
  4. D.The greater the intensity of the incident light, the greater the energy of the emitted electron.
Show the answer and explanation

Answer: C (The energy of the emitted electron depends on the wavelength of the incident light)

Explanation

The maximum energy of a photoelectron is hf − W = hc/λ − W, so it depends on the wavelength (frequency) of the light, not its intensity.