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Mathematica Representation of a wave

  1. Mar 4, 2007 #1
    1. The problem statement, all variables and given/known data

    "A sinusoidal wave is propagating along a stretched stringas a function of time is graphed in the figure (attached) for particles at x = 0 and x =0.0900m. a) what is the period of the wave ( my ans = 0.04 sec

    b) what is the amplitude of the wave ( my ans = 4mm)

    c)you are told that the 2 points x=0 and x=0.0900m are within one wavelength of each other. If the wave is moving in the +x direction, determine the wavelenght and the wave speed."

    2. Relevant equations

    y(x ,t) = A cos(2pi ( x/lambda - t/T))

    ie the mathematical representation of a wave

    3. The attempt at a solution

    I have already posted this Q previously, but fear that how I posted it made it seem unsolvable, this is what I did again:

    0.75 = cos (2pi (0.09/lambda - 0 )) where I get lambda, and thus wavelength to equal 0.78...... which isnt correct since the answer is something like 0.14m

    any pointers on how to solve would be great!!

    Attached Files:

  2. jcsd
  3. Mar 5, 2007 #2
    I cant open your attachment as yet (its still pending approval) but I'll assume you took the period and amplitude from information of the graphs.

    Do the two graphs should show a phase difference? If they do, you can easily use this to establish how long the wave takes to get from the first point to the second. Youve then got a distance and a time from which a speed is easy.
  4. Mar 6, 2007 #3
    yeah i got it now....u use the distance travelled...ie between 2 waves...so from say a peak to the next peak ...adn diide by time...makes it REAL simple when you consider this way....cheers for the attempt...no1 else seemed to b able to get it?
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