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Homework Help: Wave Reflection

  1. Jun 4, 2008 #1
    1. The problem statement, all variables and given/known data
    We have waves propagating in the air. First part asks for a traveling wave solution in the x direction , given a wave length 2pi and amplitude 3m. I have obtained u(x,t) = 3 cos ( x - 345t). The question then asks what happens if a wall is placed at x=0, what is the form of u(x,t) including the reflect wave and incident wave. Also to find the amplitude and phase of the reflect wave given u(0,t) = 0.

    2. Relevant equations

    3. The attempt at a solution
    I have hit a wall. No idea how to proceed with the form of the equation. Once I get that, I am pretty sure I will manage to find the phase shift and amplitude.
  2. jcsd
  3. Jun 5, 2008 #2


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    Science Advisor
    Homework Helper

    :biggrin: Then you should reflect! :biggrin:

    Hint: draw a diagram!

    Draw the wave going through the wall as if it wasn't there.

    Then turn one half of the wave round …

    does it have the same frequency? the same amplitude? the same velocity? the same phase? :smile:
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