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At a distance r = 100 m from a isotropic...

At a distance `r = 100 m` from a isotropic point sources of sound 200 Hz the loudness level is `L = 50 dB`. The standard intensity level, i.e., intensity level just audible to human ear is `I_(0) = 0.1 n W//m^(2)`. Find the sonic power of the source.

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1.25 W
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