Light exhibits a dual nature, consisting of both particle and wave characteristics. The wave nature of light is insufficient to account for the particle nature of light. According to the photoelectric effect, when photons (which are energy packages of light) collide with electrons on a surface, they provide enough energy for the electrons to jump out of the metal surface. The intensity of light is solely determined by the frequency of the incident light, and not by the wave nature or amplitude of the light waves. The explanation of the photoelectric effect relies on the particle nature of light. The phenomenon cannot be explained by wave nature alone.