Intensity of Spherical Wave

Intensity of Spherical Wave

### Formula

$$I=\frac{P}{4\pi r^2}$$

### Terminologies

- I → Intensity of wave.

- P → Power of source.

- r → Distance from source.

### Conditions / Special Cases

- Intensity decreases with distance:

$$I\propto\frac{1}{r^2}$$

### Usage

- Used in sound intensity variation problems.