Energy transfer takes place in mechanical wave because of

Options

A. the coupling through elastic forces between neighbouring oscillating parts of the medium
B. the convection process exciting the molecules in different parts of the medium
C. thermal conduction through molecules
D. all of the above

Answer

To solve the question regarding energy transfer in mechanical waves, we can break down the explanation step by step:

### Step-by-Step Solution:

1. **Understanding Mechanical Waves**:
- Mechanical waves require a medium (solid, liquid, or gas) to propagate. They transfer energy through the oscillation of particles in the medium.

2. **Identifying Energy Transfer Mechanism**:
- In mechanical waves, energy is transferred from one particle to another through interactions. This interaction is primarily due to the forces acting between neighboring particles.

3. **Elastic Forces**:
- When a particle in the medium oscillates, it exerts a force on its neighboring particles. This force is often due to the elastic properties of the medium, which means that the particles will return to their original position after being displaced.

4. **Coupling Through Elastic Forces**:
- The energy transfer in mechanical waves occurs because of the coupling through elastic forces between neighboring oscillating parts of the medium. When one particle moves, it pulls or pushes its neighbors, causing them to move as well, thus transferring energy.

5. **Considering Other Options**:
- The other options (b and c) mention convection processes and thermal conduction. While these processes can transfer energy, they are not the primary mechanisms for energy transfer in mechanical waves. Mechanical waves primarily rely on the elastic forces.

6. **Conclusion**:
- Therefore, the correct answer is that energy transfer in mechanical waves occurs because of the coupling through elastic forces between neighboring oscillating parts of the medium, which corresponds to option (a).

### Final Answer:
**Energy transfer takes place in mechanical waves because of (a) the coupling through elastic forces between neighboring oscillating parts of the medium.**