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Homework Help: Displacement of a point on a progressive wave

  1. May 30, 2015 #1
    1. The problem statement, all variables and given/known data
    upload_2015-5-30_14-44-32.png
    upload_2015-5-30_14-44-53.png

    2. Relevant equations


    3. The attempt at a solution
    I wrote that Y will have a negative displacement, before returning to equilibrium. Why is Y's displacement positive instead?
     
  2. jcsd
  3. May 30, 2015 #2
    This wave travelling to "+" or right direction so the wave function is: ## \Psi(x,k) = A\sin(\omega{t} - kx) ##.
    Simpler, imagine the wave curve travelling to the right.
     
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