In a solid rod the sound waves will be

Options

A. Longitudinal as well as transverse
B. Longitudinal only
C. Transverse only
D. None of these

Explanation

To answer the question "In a solid rod, the sound waves will be:", we can analyze the properties of sound waves in solids step by step.

### Step 1: Understanding Sound Waves
Sound waves can be classified into two main types: longitudinal waves and transverse waves.

- **Longitudinal Waves**: In these waves, the particles of the medium move parallel to the direction of wave propagation. An example of this is a sound wave traveling through air.

- **Transverse Waves**: In these waves, the particles of the medium move perpendicular to the direction of wave propagation. An example of this is waves on a string.

### Step 2: Characteristics of Solids
Solids have unique properties that allow both types of waves to propagate:

- **Rigidity**: Solids possess rigidity, meaning they can resist changes in shape. The particles in solids are closely packed and held together by strong forces of attraction, allowing them to transmit vibrations effectively.

- **Particle Movement**: When a particle in a solid is disturbed from its equilibrium position, it tends to return to that position due to the restoring forces acting on it. This allows for the propagation of both longitudinal and transverse waves.

### Step 3: Wave Propagation in Solids
In solids:

- **Longitudinal Waves**: When a sound wave travels through a solid, the particles vibrate back and forth in the same direction as the wave travels. This is possible due to the strong interatomic forces that allow the particles to transmit the compressions and rarefactions of the wave.

- **Transverse Waves**: Additionally, the rigidity of solids allows them to support transverse waves, where the particle displacement is perpendicular to the direction of wave propagation. This is not possible in fluids (liquids and gases) due to their inability to maintain shape under shear stress.

### Conclusion
Based on the properties of sound waves and the characteristics of solids, we conclude that in a solid rod, sound waves can be both longitudinal and transverse. Therefore, the answer to the question is:

**Answer**: Longitudinal as well as transverse.

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