In a pipe closed at one end, the fundamental note has
Correct answer: A. a node at the closed end and an antinode at the open end
- A. a node at the closed end and an antinode at the open end
- B. antinodes at both ends
- C. nodes at both ends
- D. an antinode at the closed end
Explanation
The air cannot move at a closed end, so a node forms there, while the open end is free to vibrate and carries an antinode. The pipe therefore holds a quarter of a wavelength at its fundamental, so the wavelength is four times the length. A pipe open at both ends holds half a wavelength and sounds an octave higher for the same length.
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About Organ Pipes
Organ pipes produce standing sound waves in air columns, with resonance determined by whether each end is open or closed. The topic covers nodes, antinodes, fundamental frequency, harmonics, wavelength and end correction. Open pipes support all harmonics, while closed pipes support only odd harmonics under the ideal model.
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