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Sound Intensity and Power

  1. Apr 12, 2012 #1
    Second problem of the day...:blushing:

    1. The problem statement, all variables and given/known data

    (part 1 of 2)
    A spherical source radiates sound uniformly
    in all directions. At a distance of 52 m, the
    sound intensity level is 46 dB.
    At what distance from the source is the
    intensity level 13 dB?
    Answer in units of m

    (part 2 of 2)
    What power is radiated by this source?
    Answer in units of W

    2. Relevant equations

    I = P/A

    A = 4[itex]\pi[/itex]r2

    3. The attempt at a solution

    I got part 1, which is 2322.8 m. But I'm not sure where to go from here. All I know is I need to solve for P in the equation but I'm not sure what to do for I.
     
  2. jcsd
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