Sound energy flux
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The sound energy flux is the average rate of flow of sound energy for one period through any specified area.
In a medium of density ρ for a plane or spherical free wave having a velocity of propagation v, the sound energy flux through the area S corresponding to an effective sound pressure p is
- J = ( p2S / ρv ) cos θ
where θ = the angle between the direction of propagation of the sound and the normal to the area S.