Intensity of Wave

Intensity of Wave

### Formula

$$I=\frac{P}{A}$$

### Relation with Amplitude

$$I\propto A^2$$

### Terminologies

- I → Intensity.

- P → Power of wave.

- A → Area.

### SI Unit

$$Wm^{-2}$$

### Conditions / Special Cases

- Intensity decreases with distance from source.

### Usage

- Used in sound and electromagnetic wave problems.