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Sinusoidal waves

  1. Mar 16, 2010 #1
    The question and attempt to solution is on the attached image. I don't understand why the answer in the textbook is 1.5ym mine is 1.8 ym
     

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  3. Mar 16, 2010 #2

    kuruman

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    If φ1 = 30o and φ2 = 80o, then φ2 - φ1 is not 30o as you claim in your solution.
     
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