The photoelectric effect is a phenomenon that does not support the wave nature of light. In this effect, electrons are emitted from a metal surface when light of a sufficiently high frequency is incident on the surface. The maximum kinetic energy of the emitted electrons is proportional to the frequency of the incident light, and it does not depend on the intensity of the light. This behavior cannot be explained by the wave nature of light, which predicts that the energy of a light wave should be proportional to its amplitude.