In a pipe closed at one end, the fundamental note has
- 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.