1. A fireworks shell explodes H=110 m above the ground, creating colorful sparks. How much greater is the sound level of the explosion for a person at a point directly below the explosion than for a person a horizontal distance of L=190 m away?

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# 2 Answers

*A fireworks shell explodes H=110 m above the ground, creating colorful sparks. How much greater is the sound level of the explosion for a person at a point directly below the explosion than for a person a horizontal distance of L=190 m away?*

The intensity of the sound waves drops off as 1/r

^{2}where r is the distance from the point where the sound is made. One observer is at a distance r_{1}=110 m; the other is at a distance of r_{2}^{2}= 110^{2}+ 190^{2}from the explosion.Take the ratio of observer 1's sound level to observer 2's:

(1/r

_{1}^{2}) / (1/r_{2}^{2}) = r_{2}^{2}/r_{1}^{2}Plug in the values of r

_{1}and r_{2}to solve.I wonder why you posted the same question twice. Please post once, it saves duplicate efforts on our part.

Also - I am curious, you said you were using Mastering Chemistry. Is this a problem in a chem class?

I did the most study of this in an EE class on e/m fields and waves, chem seems a strange place for this.

There are a couple extra tidbits in the answer to the other post you might find interesting.

## Comments

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