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If you hold a 1.06 m metal rod in the center and hit one end with a hammer, it will oscil- late like an open pipe.

If you hold a 1.06 m metal rod in the center
and hit one end with a hammer, it will oscil-
late like an open pipe. Antinodes of air pres-
sure correspond to nodes of molecular motion,
so there is a pressure antinode in the center of
the bar. The speed of sound in aluminum is
5150 m/s.
What would be the lowest frequency of os-
cillation?
Answer in units of kHz.

This question was asked on Apr 22, 2010.

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