Power radiated by a sound source

  1. Sir,
    A loud speaker having a circular opening of diameter 20 cm is emitting sound waves uniformly. The intensity of sound at the opening is 0.2 milli watt/m^2. What is the power radiated by the source?
    I solved it in the following way:
    Intensity = power/Area
    Here Area = (pi)R^2
    = 3.14 x 0.01
    = 0.0314 m^2
    Power = 0.2 x 0.0314 milli watts
    = 6.28 x 10^(-6) watts
    Is it right?
  2. jcsd
  3. Sir,
    Please respond.
  4. Andrew Mason

    Andrew Mason 6,959
    Science Advisor
    Homework Helper

    Amith, No one is responding to this because it is trivial. You are saying:

    A/B = x

    And then asking:

    Does A = Bx?

    This is hardly advanced physics.

  5. I think what he is saying is:

    Does A/B = x ? In other words, does A = bx ??
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