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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 t...Asked by Anonymous
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 1.90 10-6 W/m2 at a distance of 120 m from the explosion. Find the distance from the source at which the intensity is 0.80 10−6 W/m2.
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Answered by
algebra
If I1 is the intensity at a distance 150 m from the source and I2 is the intensity at a distance of d m from the source ,
I1 *150^2 = I2 *d^2
d^2 =[ I1 / I2 ]*150^2
[I1 / I2] = 1.9 /0.8= 2.375
d^2 = 2.375*150^2
d =231.17 m.
I1 *150^2 = I2 *d^2
d^2 =[ I1 / I2 ]*150^2
[I1 / I2] = 1.9 /0.8= 2.375
d^2 = 2.375*150^2
d =231.17 m.
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