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Homework Help: Wave interference

  1. Nov 12, 2008 #1
    If the amplitude of three intersecting waves is given by

    [tex]y(r,t) = \frac{A}{r}e^{i(kr-wt)}[1-2cos(kdsin\theta)][/tex]

    how can I then find the intensity at r = 200 m as a function of [tex]\theta[/tex]?

    I know that intensity is the square of the amplitude. Should I simply square y(r,t)? If I do, I get I as a function of t as well, because of the part [tex]e^{i(kr-wt)}[/tex].
  2. jcsd
  3. Nov 12, 2008 #2
    intensity is [tex]I=A^* A[/tex]
    where A is the amplitude
    so that makes the exponential term go away
  4. Nov 12, 2008 #3
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