Q. The sound power level of an outdoor non-directional point source is 90 dB. Considering an atmospheric impedance of 400 rayls, the sound pressure level at 10 m distance from the source is _______dB.
Ans: 58 to 60
Sol:
Putting values of Lw = 90, r = 10 m, Lp = 59,00 dB
(No role of atmospheric impedance)
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