When Two Organ Pipes Open at Both Ends Sound a Perfect

question 8

Multiple Choice

When two organ pipes open at both ends sound a perfect fifth, such as two notes with fundamental frequencies at 440 Hz and 660 Hz, both pipes produce overtones. Which choice below correctly describes overtones present in both pipes?

• A) 440, 880 and 1 320 Hz.
• B) 660, 1 320 and 1 980 Hz.
• C) 880, 1 320 and 1 760 Hz.
• D) 1 320, 2 640 and 3 960 Hz.
• E) They have no overtones in common.

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