(a) Why photoelectric effect cannot be explained on the basis of wave nature of light?
(b) Write the basic features of photon picture of electromagnetic radiation on which Einstein's photoelectric equation is based.

Explanation

### Solution:

**(a) Why the photoelectric effect cannot be explained on the basis of wave nature of light?**

1. **Instantaneous Ejection of Photoelectrons**:
- The wave theory of light suggests that light behaves as a continuous wave. If this were true, it would take time for the energy to build up to a level sufficient to eject electrons from a metal surface. However, experiments show that photoelectrons are emitted almost instantaneously when light of a certain frequency (above the threshold frequency) strikes the metal surface. This instantaneous effect cannot be explained by the wave nature of light.

2. **Threshold Frequency**:
...