Does the Doppler effect increase the intensity of wave when its source approaches the observer?

Explanation

To determine whether the Doppler effect increases the intensity of a wave when its source approaches the observer, we can analyze the relationship between frequency, intensity, and the Doppler effect.

### Step-by-Step Solution:

1. **Understand Intensity**:
- Intensity (I) of a wave is defined as the power (P) per unit area (A). Mathematically, it can be expressed as:
\[
I = \frac{P}{A}
...