7 Impurity Scattering

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There is an impurity of adjustable mass at the center of the chain. What happens as the packet moves across the impurity? How does the amplitude of scattering depend upon the impurity mass? (You can make the impurity mass greater than the host mass by typing in values or dragging the slider far to the right.)

With a small impurity mass, run for a full round trip. What are the small amplitude wiggles in the time range when neither packet is near the impurity?