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Homework Help: Sound wave Physics Problem Help

  1. Feb 11, 2007 #1
    so i have some questions on how to set up this one problem on my homework.

    Here is the problem:

    A person sees a heavy stone strike the concrete pavement. A moment later, two wounds are heard from the impace: one travels through the concrete and the other through air, and the sounds are heard 1.4 seconds apart. how far away did the impact occur?

    i got the velocity in air to be 343 m/s and the velocity through concrete to be 2949 m/s by the elastic modulus equation. how would i go setting up equations for this problem? i tried T(in concrete)=T(in air)-1.4 and used D=D to set up

    V(in air)T(in air)=V(in concrete)[T(in air)-1.4]

    would this setup work, or would another set up work any better?

  2. jcsd
  3. Feb 11, 2007 #2
    that's what I would do.
  4. Feb 11, 2007 #3
    ok i got it. i just made a stupid mistake in solving the problem. thanks
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