Question: What is the work function of a material in the context of the photoelectric effect?

Options:

1. The energy required to remove an electron from the material
2. The energy of the incident photon
3. The energy of the emitted electron
4. The total energy of the material

Correct Answer: The energy required to remove an electron from the material

Solution:

The work function is the minimum energy required to remove an electron from the surface of a material.