Sound Intensity Illustration of Basic Concept
Energy Distributed over Spherical Surface
Area = 4 ? r2
Free Space
Source
Sound Power= W
Radiates uniformly
into Free space
Intensity = W / 4 ? r2
(watts/m2)
In Free Field :
Intensity = p2 / ?c
Intensity is directly related to mean square sound pressure
P
Gauss’s Law
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