In photoelectric effect, the quantity that does NOT affect the work function is the

Explanation

The correct answer is the intensity of incident light. The work function is a property of the material and is related to the minimum energy needed to eject an electron from the surface. It is not influenced by the intensity of the light, which only affects the number of electrons emitted. The nature of the emitter material determines the work function, while the frequency of the incident light must be above a certain threshold to cause photoemission. The potential difference affects the energy of emitted electrons after they have been ejected, not the work function itself.