The intensity of sound from a point source is `1.0 xx 10^-8 Wm^-2`, at a distance of 5.0 m from the source. What will be the intensity at a distance of 25 m from the source ?
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`I_(1)=2mu W//m^2, r_(1)=4m, r_(2)=40m, I_(2)=?` `I_(1)/I_(2)=r_(2)^2/r_(1)^2, I_(2)=I_(1) (r_1/r_2)^2` `I_(2)=2 ((4)/(40))^2=2 xx 1/(100)=2 xx 10^(-2) mu M//m^2`
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