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Need help with this question on sound please! new member!

  1. Nov 19, 2008 #1
    Need urgent help with this question on sound please! new member!

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

    The intensity of sound at the minimum threshold of hearing is 1*10^-12 W/m^2. A listner hears a 115 dB sound as an automobile passes by at a distance of 9.0 meters.
    a) what is the sound intensity in W/m^2 ?

    b) About how much power is the car dissipating into sound waves?
     
  2. jcsd
  3. Nov 19, 2008 #2

    Hootenanny

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    Re: Need urgent help with this question on sound please! new member!

    Welcome to Physics Forums.

    You seem to have missed out two important sections of the homework template.
     
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