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JAMB Physics 2003 Question 44

Question 44

Modern Physics

The maximum kinetic energy of the photoelectrons emitted from a metal surface is 0.34eV. If the work function of the metal surface is 1.83eV, find the stopping potential.

  1. A.2.17V
  2. B.1.49V
  3. C.1.09V
  4. D.0.34V
Show the answer and explanation

Answer: D (0.34V)

Explanation

The stopping potential must cancel the maximum kinetic energy: eVs = 0.34 eV, so Vs = 0.34 V. The work function is not needed.