Choose the correct snapshot graph longitudinal waves

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SUMMARY

The discussion focuses on interpreting a snapshot graph of longitudinal waves, specifically identifying the correct representation of displacement from equilibrium. Participants agree that the displacement (D) indicates positions relative to equilibrium, with negative values indicating positions closer than equilibrium and positive values indicating positions further away. The consensus is that option "a" accurately reflects the graph's data, particularly at the 3 cm mark where the displacement is -1 cm, confirming that the dot moves left to a position of 2 cm.

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firezap
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Homework Statement


http://i.imgur.com/4dL6TQY.jpg

I don't know how to read the figure or the graphs. O_O
 
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firezap said:

Homework Statement


http://i.imgur.com/4dL6TQY.jpg

I don't know how to read the figure or the graphs. O_O

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...
 
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.
 
firezap said:
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.
Yes, it's a.
 

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