At a distance r = 100 m from a point isotropic source of sound of frequency 200

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At a distance r = 100 m from a point isotropic source of sound of frequency 200 Hz the loudness level is equal to L = 50 dB. The audibility threshold at this frequency corresponds to the sound intensity Io = 0.10 nW/m2. The damping coefficient of the sound wave is 7 = 5.0 ∙ 10-4 m-1. Find the sonic power of the source.
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