Which of the following relate to wave nature of light or particle nature or both ?
(a) Interference (b) Diffraction (c) Photoelectric effect (d) Black body radiation
(e) Planck's equation, E = hv (f) Einstein equation, `E = mc^(2)`

Explanation

To determine whether the phenomena listed relate to the wave nature of light, the particle nature of light, or both, we can analyze each one step by step.

### Step-by-Step Solution:

1. **Interference**:
- Interference is a phenomenon that occurs when two or more waves overlap and combine to form a new wave pattern. This is characteristic of wave behavior.
- **Conclusion**: Interference relates to the wave nature of light.

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