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Determine the direction of movement of a point on wave

  1. Jan 19, 2012 #1
    1. The problem statement, all variables and given/known data
    1-3.jpg

    The figure shows a longitudinal wave moving to the right. Indicate the direction of motion of the points A and B


    2. Relevant equations



    3. The attempt at a solution
    How to determine the direction; either to the left or right?

    Thanks
     
  2. jcsd
  3. Jan 19, 2012 #2
    If not told the direction the wave was traveling the sketch could be three things, a longitudinal wave traveling to the left or traveling to the right, and also a standing longitudinal wave.
     
  4. Jan 19, 2012 #3
    It is given in the question, the wave is moving to the right. However, I still don't know how to determine the direction of movement of the points :tongue:
     
  5. Jan 19, 2012 #4
    Let the density of your wave material be,

    ρ = 1 + Δcos(x - t) where Δ << 1

    dρ/dt = - dJ/dx --> J = Δcos(x - t) ?

    Where the density peaks the velocity peaks in the forward direction and where the density is minimum the velocity peaks in the backwards direction, see,

    http://lifgarbagez.ucdavis.edu/~dmartin/phy7/7C/java/longitudinal.html [Broken]

    Make the wave go to the right and slow it down.
     
    Last edited by a moderator: May 5, 2017
  6. Jan 19, 2012 #5
    Sorry I haven't covered about the density of wave material and I don't have the plugin to open the link given; I'll try to install it later.

    Is there any easier way to explain point A moves either to the left or right? Because this is actually lesson for eight grade (second year of middle school)
     
    Last edited by a moderator: May 5, 2017
  7. Jan 26, 2012 #6
    My best guess is that A and B is compression and it will turn to rarefaction so A will move to the left and B to the right...but that's just pure guess :biggrin:
     
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