5A.
Intensity = P/A
I = P/(4*pi*r^2)
I = 80/(4*pi*3^2)
I = 0.707 W/m^2
5B.
I = P/(4*pi*r^2)
r = sqrt (P/(4*pi*I))
r = sqrt (80/(4*pi*10^-8))
r = 25231.32 m = 25.23 km
5. A point source emits a sound with an average power output of 80.0w. a) What...
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