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Wave intensity at different points

  1. Jul 13, 2014 #1
    1. The problem statement, all variables and given/known data

    here's the question , ans any my hand written working. which one is correct ? my ans or the model answer?

    2. Relevant equations



    3. The attempt at a solution
     

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  2. jcsd
  3. Jul 14, 2014 #2

    rude man

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    Theirs is.
    Why are you introducing r? They are giving you the amplitudes already, you don't have to calculate them. And intensity is proportional to amplitude squared. This is true for water waves and it's true for electromagnetic waves.
     
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