Wave-particle duality, which suggests that light sometimes behaves like a wave and other times like a particle, cannot be fully explained by the wave theory of light. The photoelectric effect and Compton effect also challenge pure wave theory by demonstrating particle-like behavior of light.
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The phenomenon of photoelectric effect cannot be explained on the basis of the wave theory of light. The wave theory predicts that the energy of a light wave is proportional to its intensity, whereas the photoelectric effect depends on the frequency of light.
Light behaves primarily as a wave when it undergoes phenomena such as diffraction and interference. These behaviors are best explained by wave theory rather than particle theory.
The particle nature of light, as described by the photon theory, cannot be fully explained by the wave model of light. The wave model also cannot account for certain phenomena such as the photoelectric effect and the behavior of light in very small scales, which require a particle-like description of light.
Certain experiments such as the photoelectric effect and the Compton effect cannot be explained by classical wave behavior. The quantized nature of light revealed by these experiments led to the development of the quantum theory of light.
The fundamental nature of light is better explained by both the wave theory and the particle theory. Light exhibits properties of both waves and particles, known as wave-particle duality. The wave theory explains phenomena like interference and diffraction, while the particle theory explains phenomena like the photoelectric effect. Both theories are needed to fully understand the behavior of light.