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. Part A What is the fundamental frequency of a 1.90m -long aluminum rod? The speed of sound in aluminum is 6420 m/s. Express your answer with the appropriate units.

Explanation / Answer

Best Answer - Chosen by Asker f = v / 2 L ; where v = speed of sound So we need to find the speed of sound in aluminum. See second web site. f = (4877 m/s) / (2·1.90m) f = 128.2 s^-1 = 128.2 Hz Source(s): http://en.wikipedia.org/wiki/Fundamental… http://www.engineeringtoolbox.com/sound-…

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