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Homework Help: Choose the correct snapshot graph longitudinal waves

  1. Feb 27, 2015 #1
    1. The problem statement, all variables and given/known data

    I don't know how to read the figure or the graphs. O_O
  2. jcsd
  3. Feb 27, 2015 #2

    Quantum Defect

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    I think that D is the displacement from equilibrium. Negative D ==> closer than equilibrium, Positive D ==> greater than equilibrium spacing. D = 0 ==> equilibrium spacing
    The first two "atoms" are spaced 1 cm apart, which is equal to the equilibrium spacing. From these clues, it looks like "a" to me, but things look screwy to me after the first four cm... It would help to know how D is being calculated...
  4. Feb 27, 2015 #3
    It's a. I look at the graph at x = 3cm and displacement = -1cm. The dot would move left 1cm, so the dot is at 2.
  5. Feb 27, 2015 #4


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    Yes, it's a.
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