Driven standing waves with different mass/unit length strings.

Two strings of highly dissimilar mass per unit length are driven into motion with vibration at one end and a hanging mass at the other. Different numbers of modes are visible on both strings. This effect is obvious but the demo is small so a camera should be used to illustrate it to a large classroom. With a 200 g mass providing tension 3 nodes are visible on the heavy string, 1 on the light.
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