If you hold a 1.1 m aluminum rod in the center and hit one end with a hammer, it will oscillate like an open pipe. Antinodes of air pressure 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 oscillation?
The auditory canal, leading to the eardrum, is a closed pipe 3.4 cm long. Find the approximate value (ignoring end correction) of the lowest resonance frequency.
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