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Homework Help: Show function satisfies classical waveequation

  1. Oct 17, 2011 #1
    1. The problem statement, all variables and given/known data
    show that y=ex-vt)7/8

    2. Relevant equations
    d2y/dt2= d2y/dx2

    3. The attempt at a solution
    i dont understand how they solve this. in the book they have dy/dt=ezdz/dt=-7/8vez(x-vt)-1/8
    I thought it would be -7/8veex-vt)7/8 not sure what they did any.
  2. jcsd
  3. Oct 17, 2011 #2
    Your wave equation is wrong, it should be: [itex] \frac{\partial^2 y}{\partial t^2} = v^2 \frac{\partial^2 y}{\partial x^2}[/itex]

    Just plug in the function y and take bunch of partials.
  4. Oct 18, 2011 #3
    o ok thxs
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