WAEC Physics 2020 Objective — Question 49
Question 49 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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In photoelectric effect, the number of electrons emitted per second from a metallic surface is proportional to the
- A. intensity of the incident radiationCorrect
- B. frequency of the incident radiation
- C. energy of the incident radiation
- D. work function of the metal
Explanation
In photoelectric effect, the number of electrons emitted per second from a metallic surface is proportional to the intensity of the incident radiation. Thus, a bright red light produces more photoelectrons per second than a faint red light.
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