The intensity of a siren is 10.9 W/m2 when you are standing 20 m away from it. Now you go 120 m away. (in other words, 6 times farther away) How loud is it now?
this requires the use of the inverse square law;
so, now,
at, r=20 m,I=10.9
P/(4*pi*r^2)= I
=>P=54789.37 watts
so, at 120 m
I=P/(4*pi*r^2)=0.302 W/m^2
The intensity of a siren is 10.9 W/m2 when you are standing 20 m away from...
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