Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook