Equation for the energy of an acoustic wave?

[mapa]

Hi, I have been looking to finding the energy of an acoustic sound wave.
I keep looking, but its not the exact equation I am looking for. I am look
for an equation of how much energy is present in a sound wave and how
it changes over distance.

Does anyone know?

 

[zhermes]

The energy in a sound wave is proportional to the square of its amplitude. How its effected by distance can be determined with a combination of conservation of energy, and examining how much area the wave covers.