Physics

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A rocket in a fireworks display explodes high in the air. The sound spreads out uniformly in all directions. The intensity of the sound is 3.14 x 10-6 W/m2 at a distance of 121 m from the explosion. Find the distance (in m) from the source at which the intensity is 1.80 x 10-6 W/m2.

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    (121^2/d^2)*3.14*10^-6 = 1.8*10^-6.
    0.046/d^2 = 1.8*10^-6.
    1.8*10^-6*d^2 = 0.046.
    d^2 = 0.02556*10^6 = 25,560.
    d = 160 m.

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