What is the relation between loudness and amplitude of sound ?

Explanation

### Step-by-Step Solution:

1. **Understanding Loudness and Amplitude**:
- Loudness is a characteristic property of sound that describes how we perceive the intensity of a sound.
- Amplitude refers to the maximum displacement of particles in a medium from their mean position when a sound wave travels through it.

2. **Defining Amplitude**:
- In a sound wave, the amplitude is the maximum distance that the particles of the medium move from their rest position. It can be visualized as the height of the wave when plotted graphically.
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