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An open organ pipe has a fundamental frequency of 430 Hz.

**A closed organ pipe has a fundamental frequency that is the second harmonic of the open organ pipe.**What are the lengths of the two pipes?

Does the bolded part mean that the fundamental frequency of the closed pipe is twice that of the open pipe? (since 2*fundamental frequency = second harmonic frequency) Something about the wording is tripping me up here.

If so, how would I find the length only knowing frequencies (not velocities or wavelengths)?

thanks!