Write the three characteristic features in photoelectric effect which cannot be explained on the basis of wave theory of light, but can be explained by using Einstein's equation.

Explanation

**Step-by-Step Solution:**

1. **Introduction to the Photoelectric Effect:**
The photoelectric effect refers to the phenomenon where electrons are emitted from a material (usually a metal) when it is exposed to light of sufficient frequency. This effect cannot be adequately explained by the wave theory of light.

2. **Characteristic Feature 1 - Kinetic Energy Independence:**
- **Explanation:** According to wave theory, it was believed that the intensity of light would determine the energy of the emitted electrons. However, experiments showed that the kinetic energy of the emitted electrons is independent of the intensity of the incident light. Instead, it depends on the frequency of the light.
- **Einstein's Equation:** Einstein's photoelectric equation states that the kinetic energy (K.E.) of the emitted electrons is given by:
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