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Homework Help: Sound waves, echo

  1. Nov 19, 2009 #1
    1. The problem statement, all variables and given/known data
    An alarm clock has been thrown down a well.

    around 100m deep well
    an alarm clock with a frequency of 368hz sounds for 3 seconds
    accelerating at 9.8 m/s2
    initial velocity 0

    2. Relevant equations
    How deep is the well? using doppler
    take in consideration of the echo
    what is the frequency of beats?

    3. The attempt at a solution

    I really have no idea :s
    all i got was that it had red shift and blue shift.
    the wall is the observer?
  2. jcsd
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