Third Harmonic

A home-made wave machine was made using string, PVC pipe and connections, a battery, two motors and some wire. The wave machine does a great job producing the second and third harmonic standing wave patterns. The third harmonic is shown here. Observe the two nodes positioned between the ends of the string.

 

For more information about the physics of standing waves, visit The Physics Classroom Tutorial - www.physicsclassroom.com/Class/waves/.

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Taken on December 7, 2010