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Wave Equation Difference

  1. Mar 12, 2013 #1
    1. The problem statement, all variables and given/known data
    This is from the Young and Freedman 13th Ed book, chapter 15 "Mechanical Waves.
    It's the same question in the book found in this link:

    My problem though is much more fundamental I guess. In the part c, the manual suggest (I ran out of hope after 3 hours) that I use y(x, t) = Asin(2π(t/T - x/λ)) +ve direction. What made me confuse is, throughout the book y(x,t) = Acos(2π(x/λ - t/T)). I reckon, its something to do with π phase difference. So what is the difference, can you derive it for me? I just dont know.

    2. Relevant equations
    y(x, t) = Asin(2π(t/T - x/λ))
    y(x, t) = Acos(2π(x/λ - t/T))
  2. jcsd
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