Define modulation index. Why is it generally kept less than one ?

Explanation

### Step-by-Step Solution:

1. **Definition of Modulation Index**:
- The modulation index (µ) is defined as the ratio of the amplitude of the modulating signal (Am) to the amplitude of the carrier wave signal (Ac).
- Mathematically, it can be expressed as:
\[ \mu = \frac{A_m}{A_c} \]
...