A plane sound wave propagates along the x-axis. At the point `x = 0`, the loudness level is `L_(0) = 60 dB`. Find : (a) the loudness level at `x = 50 m`, (b) the co-ordinates x at which the sound is not heard any more (`mu`, the absorption coefficient of the medium `= 0.04 m^(-1)` Audible level of sound = 1 dB)

Answer

51.4 dB, 0.347 km