Answer: f/2.
- A f/2
- B f
- C 2f
- D f/4
Correct answer: A. f/2
Explanation: Open pipe: f<sub>open</sub> = v/(2L). Closed pipe: f<sub>closed</sub> = v/(4L) = f<sub>open</sub>/2.
A standing wave forms from two identical waves travelling in opposite directions and interfering; nodes (always zero displacement) and antinodes (maximum displacement) stay fixed in place, unlike a travelling wave where the whole pattern moves.
Concept context
Wave types, superposition, standing waves, Doppler effect, and sound intensity.