WAEC Physics 2020 Objective — Question 29
Question 29 of 50 from the West African Examinations Council (WAEC) Physics 2020 Objective paper, with the correct answer and a full explanation.
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Which of the following statements about photoelectrons is correct?
- A. A faint green light produces photoelectrons with less kinetic energy than a bright red light
- B. A red light releases a smaller number of electrons than a green light
- C. A faint green light produces photoelectrons with greater kinetic energy than a bright red lightCorrect
- D. A red light produces more photoelectrons than a green light
Explanation
A faint green light has a lower wavelength and hence higher photon energy than a bright red light; thus it produces photoelectrons with greater kinetic energy than a bright red light, though fewer in number since it's fainter (lower intensity).
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