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confusedinphys
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Homework Statement
You are standing by the roadside as a truck approaches, and you measure the dominant frequency of the truck noise at 1100 Hz. As the truck passes, the frequency drops to 950 Hz. What is the truck's speed?
Homework Equations
f'= f (vsound)
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(vsound-velocity of source)
1100 = 950(340)
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(340-vs)
The Attempt at a Solution
I rearrange for velocity of source and get 47 m/s, but my book says 25 m/s