sound energy flux

sound energy flux

Download Acoustical Society of America Standards

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 c, the sound energy flux through the area S corresponding to an effective sound pressure p is

J = ( p²S / ρc ) cos θ

where θ = the angle between the direction of propagation of the sound and the normal to the area S.

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