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Homework Help: Sound Energy

  1. Dec 10, 2007 #1
    1. The problem statement, all variables and given/known data

    The sound level 24 m from a loudspeaker is 66 dB. What is the rate at which sound energy is produced by the loudspeaker, assuming it to be an isotropic source?


    2. Relevant equations


    Something to do with Intensity?

    3. The attempt at a solution

    I dont know where to begin on this problem. My book doesnt describe any problems that are related to distance nor does it have any equations that are related to distance.
  2. jcsd
  3. Dec 10, 2007 #2
    First, convert the 66dB to Watts. (http://en.wikipedia.org/wiki/Decibel) look in the example section if you don't know how to do that. This will give you the energy rate 24m away.

    Next, you'll need to find some formula which relates how energy falls off with distance...any ideas? Look in your book for a formula with (distance)^2 in the denominator.
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