Question: Which of the following statements is true regarding the photoelectric effect?

Options:

1. Electrons are emitted only if the light is of high intensity
2. Electrons are emitted regardless of the frequency of light
3. There is a threshold frequency below which no electrons are emitted
4. The photoelectric effect can occur with any type of electromagnetic radiation

Correct Answer: There is a threshold frequency below which no electrons are emitted

Solution:

The photoelectric effect requires a minimum threshold frequency; below this frequency, no electrons are emitted regardless of the intensity of the light.