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The sound energy flux ''q'' 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 ''A'' corresponding to an effective Sound Pressure ''p'' is

J = (p2A / ρ v)


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