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Homework Help: Graph of a wave function and how to work out velocity from it.

  1. Nov 27, 2007 #1
    1. The problem statement, all variables and given/known data
    Open Question 2.bmp


    2. Relevant equations



    3. The attempt at a solution

    Open Answer 2.bmp

    I really struggled with this one, my answer is nothing more than an incomplete educated guess.
     

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  2. jcsd
  3. Nov 27, 2007 #2

    robphy

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    In terms of the wave-function... graphically (or visually) speaking.... what does "velocity" mean?
     
  4. Nov 27, 2007 #3
    "Velocity" means the speed the object (or in this case wave) is moving at in a certain direction.

    But I don't know how to obtain the value of Velocity from the graph (that I still do not know how to draw).
     
  5. Nov 27, 2007 #4

    robphy

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    At some time t=T, consider a snapshot of the graph. Focus on particular point (a bump, if wish) located at x=X on the graph. So, that feature has height H=g( 0.5X - 3T ). As T increases, what happens to that feature [keeping that height the same (which means keeping constant (0.5X - 3T) ]?

    It might help to redraw your function at various times t (as suggested in your assignment).
     
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