CAPE Physics Unit 2 · 2017 · Paper 1 · Question Q31

Which of the following statements correctly describes the photoelectric effect?

1. (A)Emission occurs only if the frequency of the incident radiation is above a certain value.
2. (B)As the intensity of the radiation increases so does the kinetic energy of the emitted electrons.
3. (C)Emission occurs only after the metal has been ionized.
4. (D)The emitted electrons all have the same kinetic energy.