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Doppler Effect Problem

  • Thread starter leinad0213
  • Start date
  • #1

Homework Statement



A physics student drops a vibrating 421 Hz tuning fork down the elevator shaft of a tall building. The temperature in the shaft is 20 °C. When the student hears a frequency of 392 Hz, how far has the tuning fork fallen?

fS = 421 Hz
fL = 392 Hz
VSOUND = 343 m/s

Homework Equations



Doppler Equation: fL = fs(VSOUND + Vlistener)/(VSOUND + VSource)

The Attempt at a Solution



I solved for the velocity of the source and got 25.38 m/s but I don't really get how I would apply it to this problem. If only I had time.
 

Answers and Replies

  • #2
HallsofIvy
Science Advisor
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How does the velocity of a dropped object incresase?
 

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