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Homework Help: How to find distance using sound waves

  1. Feb 26, 2013 #1
    1. The problem statement, all variables and given/known data

    2. Relevant equations
    x = (v_0)^2 - (1/2)gt^2

    3. The attempt at a solution
    Well, since the stone is dropped from rest, and the down direction is negative, the displacement is:

    x = -(1/2)gt^2
    x = -(1/2)(9.8 m/s^2)(3.00 s)^2
    x = -44.1 m.

    But this is incorrect and I don't recall any equation to express distance using sound waves given only the time since there isn't any other information we can assume from the free-fall I think.
  2. jcsd
  3. Feb 26, 2013 #2


    User Avatar

    Sound has a finite speed; you can look up its value. The time between dropping the stone and hearing the splash is the time the stone takes to fall plus the time the sound takes to reach your ears.
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