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(A) When k is high (2,100 N/m here), experiments show that both the pulse width and the pulse velocity (as determined by the slope) are much higher, even with the same value of d (18.6 mm), than (B) when k is low (80 N/m here). (C) The same comparison can be made by taking experimental snapshots of the two different systems (k = 80 N/m and k = 2,100 N/m, corresponding to the differences in morphology of these elements, as pictured in Insets).
