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Unformatted text preview: I = P 4 r 2 P = power of source , r = distance from source Intensity Level 10 log I I o in decibels (db) , I = intensity , I o = 10-12 W / m 2 Doppler Effect f = f 1 v o v 1 m v s v f = source frequency , f = observed frequency v = speed of sound , v o = speed of observer , v s = speed of source...
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- Spring '08