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## Homework Statement

An explosion occurs at the end of a pier. The sound reaches the other end of the pier by traveling through three media: air, fresh water, and a slender metal handrail. The speeds of sound in air, water, and the handrail are 343, 1482, and 5040 m/s, respectively. The sound travels a distance of 150 m in each medium.

(a) Through which medium does the sound arrive first, second, and third?

(b) After the first sound arrives, how much later do the second and third sounds arrive?

## Homework Equations

v=sqrt(B/density)

## The Attempt at a Solution

We just started going over waves and sound so I'm not sure how to figure out this problem.

For part (a) I figured out that the sounds arrives first at the steel handrail, then freshwater then air.

For part (b) I don't know how to figure that out. I tried just doing how many seconds it would take to travel 150m for each substance, but I don't think that's right.