- #1

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## Homework Statement

Find the speed of a car if the tone of the horn drops by 36 percent as it passes you. The speed of sound is 340 m/s. Answer in units of km/h.

## Homework Equations

f'=f(v/(v-v_source))

solce for v source.

## The Attempt at a Solution

I thought I would just set .36f = f (340/(340-x)) and solve for x (x= -604.4) this is not the right answer.