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Intensity of sound

  1. Sep 14, 2008 #1
    1. The problem statement, all variables and given/known data

    A concert loudspeaker suspended high off the ground emits 27.0 W of sound power. A small microphone with a 0.700cm^2 area is 55.0 m from the speaker.


    What is the sound intensity at the position of the microphone?



    How much sound energy impinges on the microphone each second?

    2. Relevant equations

    I = P/a

    I1 /I2 =R2^2 / R1^2


    3. The attempt at a solution

    I tried this as the solution

    27W / (pi * (55m^2)) = .00284W/m^2. The answer is incorrect.

    I could not answer question 2 since it is realted to question 1. PLEASE HELP
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
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