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Homework Help: A sinusoidal wave

  1. Sep 22, 2007 #1
    pls help me on this problem, thanks a lot.

    A sinusoidal wave is described by y=(0.30 m)sin(0.20x-40t). Determine the wave speed.
  2. jcsd
  3. Sep 23, 2007 #2
    What are the individual parts of the sin wave? 0.30 would be your amplitude, right? Break it down. What is the .20x and -40t?

    A sin wave holds the form y = Asin(wt - kx + phase shift) + D, where D is DC offset. w is in rad/sec. K is .20, which is your WAVE number. K = 2*pi*f/c = 2*pi/lambda = w / c. Go from there.

    This should probably be moved to the HW forums.
    Last edited: Sep 23, 2007
  4. Sep 24, 2007 #3

    I got it.
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