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About intensity of sound wave

  1. Oct 1, 2007 #1
    Suppose we have two source of disturbance to produce sound waves.
    The intensity of sound produced by the first source at P is I1, and the other intensity is I2. So what is the intensity at point P.

    I see many books saying that I=I1+I2. Can you explain why?

    net medium displacement vector s=vector s1+vector s2
    we have I=(1/2).p.v.(w.Sm)^2 p is the density of medium, v is sound speed, Sm is displacement amplitude of s

    yet I1=(1/2).p.v.(w.S1m)^2, I2 =(1/2).p.v.(w.S2m)^2

    obviously I doesn't equal to I1+I2 !!!

    Thank you.
  2. jcsd
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