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Homework Help: Doppler Effect Problem

  1. Oct 22, 2011 #1
    1. The problem statement, all variables and given/known data

    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

    2. Relevant equations

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

    3. 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.
  2. jcsd
  3. Oct 22, 2011 #2


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    Science Advisor

    How does the velocity of a dropped object incresase?
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