If the amplitude of a wave is doubled, what will be the effect on its loudness ?

Explanation

To determine the effect on loudness when the amplitude of a wave is doubled, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Relationship Between Loudness and Amplitude**:
Loudness (L) is directly proportional to the square of the amplitude (A) of the wave. This can be expressed mathematically as:
\[
L \propto A^2
...