Wave theory of light is not initially accepted because

Options

A. It does not explain reflection and refraction
B. It does not explain photoelectric effect
C. It does not explain Doppler.s effect
D. It does not explain propagation of light through vacuum

Answer

**Step-by-Step Solution:**

1. **Understanding Wave Theory of Light**: The wave theory of light, proposed by scientists like Huygens, describes light as a wave that travels through a medium. This theory was widely accepted for explaining phenomena such as reflection, refraction, and diffraction.

2. **Introduction of the Photoelectric Effect**: The photoelectric effect is a phenomenon where electrons are emitted from a material when it is exposed to light of certain frequencies. This effect was observed experimentally and could not be explained by the wave theory.

3. **Limitations of Wave Theory**: The wave theory suggests that light should behave like a continuous wave. According to this theory, increasing the intensity of light (not its frequency) should increase the energy imparted to electrons. However, experiments showed that only light above a certain frequency could cause electron emission, regardless of its intensity.

4. **Particle Nature of Light**: The inability of the wave theory to explain the photoelectric effect led to the development of the particle theory of light, proposed by Einstein. This theory introduced the concept of photons, which are discrete packets of energy. This explained why only light of certain frequencies could cause the emission of electrons.

5. **Conclusion**: Therefore, the wave theory of light was not initially accepted because it could not explain the photoelectric effect, which demonstrated the particle nature of light.

**Final Answer**: The wave theory of light is not initially accepted because it could not explain the photoelectric effect.

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