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What lets a sound or light wave through

  1. Aug 20, 2014 #1
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Aug 20, 2014 #2


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    Hello PP, and welcome to PF.
    Please use the template and not the title of the post.
    I have no idea what you are asking, or at what level I should try to help you
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