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Wave question

  1. Dec 1, 2016 #1
    1. The problem statement, all variables and given/known data

    I'm stuck on part ii).


    2. Relevant equations


    3. The attempt at a solution

    I'm confused as to how I would know the direction the wave is travelling at one instant on the (sine) wave??
     

    Attached Files:

  2. jcsd
  3. Dec 1, 2016 #2

    DrClaude

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    Staff: Mentor

    The problem states that it is a stationary wave.
     
  4. Dec 1, 2016 #3
    ok, so does this mean y and z are travelling up if the wave is moving left to right? or is it moving down at points y and z since they're closest to the guy on the right?
     
  5. Dec 1, 2016 #4

    DrClaude

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    Staff: Mentor

    Since it is a stationary wave, nothing is moving left or right. There are fixed nodes (points where the string doesn't move).
     
  6. Dec 2, 2016 #5
    okay so since it's a standing wave, the 'string' is moving up and down, so doesn't this mean that y and z are about to move up??
     
  7. Dec 2, 2016 #6

    haruspex

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    Even if it were a travelling wave, all the string does is move up and down. What moves left or right is the overall shape, perceived as though it were a rigid object. It is effectively an optical illusion. In a standing wave, the illusion is different.

    Do you have an equation for a standing wave? You did not list any equations.
     
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