Which of the following does not relate to photon both as wave motion and as stream of particle ?

Options

A. `E = hv`
B. `E = mc^(2)`
C. Interference
D. Diffraction

Answer

To solve the question "Which of the following does not relate to photon both as wave motion and as stream of particle?", we will analyze each option provided.

### Step-by-Step Solution:

1. **Understand the Concept of Photon**:
- A photon is a quantum of electromagnetic radiation. It exhibits both wave-like and particle-like properties, which is a fundamental concept in quantum mechanics.

2. **Review the Options**:
- We need to identify which option does not relate to the dual nature of photons.

3. **Evaluate Each Option**:
- **Option A: H = hν (Planck's equation)**:
- This equation relates energy (E) of a photon to its frequency (ν) using Planck's constant (h). It represents the wave nature of photons and also supports the particle aspect since it quantifies energy in discrete packets (photons). Thus, this option relates to both wave motion and particle nature.

- **Option B: E = mc² (Einstein's equation)**:
- This equation states that energy (E) is equal to mass (m) times the speed of light squared (c²). It describes the equivalence of mass and energy but does not specifically relate to photons as both waves and particles. Therefore, this option does not relate to both aspects.

- **Option C: Interference**:
- Interference is a phenomenon that occurs with waves. It demonstrates the wave nature of light but does not address the particle aspect. Thus, this option does not relate to both.

- **Option D: Diffraction**:
- Similar to interference, diffraction is also a wave phenomenon. It shows the wave nature of light but does not account for the particle nature of photons. Therefore, this option does not relate to both.

4. **Conclusion**:
- The options that do not relate to photons as both wave motion and stream of particles are **Option B (E = mc²)**, **Option C (Interference)**, and **Option D (Diffraction)**.
- The only option that does relate to both is **Option A (H = hν)**.

### Final Answer:
The options that do not relate to photon both as wave motion and as stream of particle are **B, C, and D**.