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7). An organ pipe, closed at one end, is vibrating in its first overtone (second harmonic),...

7). An organ pipe, closed at one end, is vibrating in its first overtone (second

harmonic), has length 61cm. A second organ pipe, open at both ends, is vibrating in

its fundamental mode (first harmonic), has length 41cm. What are the frequencies of

the tones from each?

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