# Equation for Sound wave power.

1. May 7, 2006

### Werg22

Was the formula tha links power and frequency (a formula that dosen't include intensity)?

2. May 7, 2006

### KingNothing

Wouldn't it just be the amplitude of the wave?

3. May 8, 2006

### FredGarvin

Power from a spherical source, is defined, in the far field as:

$$\Pi = \frac{4 \pi r^2 p^2_{rms}}{\rho_o c}$$

4. Jul 30, 2010

### ljde

How do you derive this equation? Thanks