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* A 1.2-m-long open-closed pipe is producing sound by vibrating with its third harmonic. (a) Determine the frequency of the sound. (b) How long should a pipe of the same type be to produce sound of the same frequency while at the fundamental frequency? (c) How would the answers to parts (a) and (b) change if the pipe was filled with helium, in which the speed of sound is about three times larger than in air? Explain.
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