At a distance r(0) = 20 m form an isotro...

At a distance `r_(0) = 20 m` form an isotropic point source of sound the loudness level is `L_(0) = 30 dB`. Neglicting the damping of the sound wave, find : (a) the loudness level at a distacne `r = 10 m` form the source, (b) the distance form the source at which sound is not heard.

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At a distance `r_(0) = 20 m` form an isotropic point source of sound the loudness level is `L_(0) = 30 dB`. Neglicting the damping of the sound wave, find : (a) the loudness level at a distacne `r = 10 m` form the source, (b) the distance form the source at which sound is not heard.

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