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 with sufficient energy (related to frequency, as \(E = h
u\), and wavelength, as \(\lambda=\frac{c}{
u}\)) strike a material. The intensity of light refers to the number of photons. If the frequency (and thus energy per photon) is below the threshold frequency (so that \(h
u < W_0\), where \(W_0\) is the work - function of the material), no electrons are ejected, regardless of the number of photons (intensity). If the frequency is above the threshold frequency, electrons are ejected. So, intensity does not determine whether the photoelectric effect occurs, but rather the number of electrons ejected (when the effect is already occurring).

Answer:

intensity