Question

a change in which property of light will have no effect on whether or not the photoelectric effect occurs?
frequency
energy
intensity
wavelength

Explanation:

The photoelectric effect occurs when photons of sufficient energy (related to frequency and wavelength) strike a material and eject electrons. Intensity is the number of photons. As long as individual photons have enough energy (determined by frequency/wavelength), changing the number of photons (intensity) won't affect whether the effect occurs, just the number of ejected electrons.

Answer:

C. intensity