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Homework Help: Wave intensity

  1. Nov 21, 2009 #1
    1. The problem statement, all variables and given/known data

    I have two waves interferencing with the same wavelenght [tex]\lambda[/tex] and average intensity [tex]I_{o}[/tex]. They also have a constant phasedifference of [tex]\varphi[/tex].

    2. Relevant equations

    The problem is that I dont know any equations or relations for the intensity of waves. I have a lousy compenium in this class.

    3. The attempt at a solution

    Im supposed to show that [tex]I_{tot}=4I_{o}cos(\frac{\varphi}{2})[/tex].

    This is probably quite easy to show, but I'm really stuck. Some information about the intensity of classical waves would be really helpful. Thanks alot!
  2. jcsd
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