Question: What is the minimum frequency of light required to eject electrons from a metal surface in the photoelectric effect?

Options:

1. It depends on the intensity of light
2. It is constant for all metals
3. It depends on the work function of the metal
4. It is equal to the energy of the incident photons

Correct Answer: It depends on the work function of the metal

Solution:

The minimum frequency required to eject electrons is determined by the work function of the metal, given by the equation E = hf, where E is the work function, h is Planck\'s constant, and f is the frequency.