A longitudinal standing wave can be created in a long, thin aluminum rod by stro

Question

A longitudinal standing wave can be created in a long, thin aluminum rod by stroking the rod with very dry fingers. This is often done as a physics demonstration, creating a high-pitched, very annoying whine. From a wave perspective, the standing wave is equivalent to a sound standing wave in an open-open tube. In particular, both ends of the rod are anti-nodes

What is the fundamental frequency of a 1.80 m -long aluminum rod? The speed of sound in aluminum is 6420 m/s.

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Explanation / Answer

Fundamental frequency = (n+1)V/2l

f = 2*V/2l

f = 2*6420/2*1.8

f = 3466.66 Hz

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