Sometimes when a vehicle is driven at a particular speed, a rattling sound is heard. Explain briefly, why does this happen and give the name of the phenomenon taking place. Suggest one way by which the rattling sound could be stopped.

Explanation

### Step-by-Step Solution:

1. **Understanding the Problem**: When a vehicle is driven at a specific speed, a rattling sound can be heard. This phenomenon is related to the vibrations of certain parts of the vehicle.

2. **Natural Frequency and Resonance**: Every object has a natural frequency at which it vibrates. When the vehicle reaches a certain speed, the natural frequency of vibration of some parts of the vehicle becomes equal to the frequency of the to-and-fro motion of the engine's piston.

3. **Occurrence of Resonance**: This condition leads to a phenomenon known as resonance. Resonance occurs when an external force (in this case, the motion of the engine) matches the natural frequency of an object, causing it to vibrate with larger amplitudes. As a result, certain parts of the vehicle start to vibrate violently, producing the rattling sound.

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