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Unilorin Post-UTME Physics 2024 (Model questions) Question 10

Question 10

Modern Physics

In the photoelectric effect, increasing the intensity of light increases

  1. A.the speed of electrons
  2. B.the number of electrons emitted
  3. C.the threshold frequency
  4. D.the energy of the electrons emitted
Show the answer and explanation

Answer: B (the number of electrons emitted)

Explanation

Brighter light means more photons, so more electrons are released. Their energy depends only on the frequency of the light.