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Homework Help: EM Waves, Interference, Intensity

  1. Oct 6, 2009 #1
    1. The problem statement, all variables and given/known data
    Q1 and 3 in this file:
    http://phstudy.technion.ac.il/~sm114075/sm09/Documents/Physics2mm_Hw7.pdf" [Broken]
    (I get how to do Q2)
    2. Relevant equations

    basic EM, Interference and Intensity related equations, I guess.

    3. The attempt at a solution

    Well, for Q1 I would want to get some sort of expressions for each of the waves, of the form Acos(wt-kr) and then figure it out from there. Thing is - the size of k is a given parameter (it says I can set the wavelength) but how can I figure out its direction?

    For Q3 I'm completely lost. There's an equation for Intensity involving only the wave formula normed and squared - Would the best thing to do is add the two waves to one function, calculate its norm and square it? Is there a nicer option?
    Last edited by a moderator: May 4, 2017
  2. jcsd
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