It says in the solution that the initial length is 20.11 cm. From what part of the question you inferred that?

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You are studying standing sound waves in an organ pipe of length, L, with one end opened and one end closed.

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b) Assume that the length of the organ pipe is L=20 cm. You have excited a standing sound wave in the tube, and you observe that it has displacement nodes at 0 cm, 8 cm, and 16 cm measured from the closed end of the pipe. In which harmonic, n, is the air in the pipe oscillating?

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It says in the solution that the initial length is 20.11 cm. From what part of the question you inferred that?

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