Standing Wave in Closed Air Column · PhysicsBowl 2014 #21

Physics

Problem

A tuning fork placed over a 5757 cmcm column of air closed only at its bottom end produces a standing wave in the 3rd harmonic. The speed of sound in air is 342342 ms\frac{m}{s}. What is the frequency of the tuning fork? (A) 150150 HzHz (B) 300300 HzHz (C) 450450 HzHz (D) 600600 HzHz (E) 900900 HzHz

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