Physics (AS & A Level) · May / June 2018 · Paper 11 · Question 27

A pipe, closed at one end, has a loudspeaker at the open end. A stationary sound wave is formed in the air within the pipe with an antinode at the open end of the pipe. The length of the pipe is 0.85 m. The speed of sound in air is 340 m s⁻¹. Which frequency of sound from the loudspeaker would not produce a stationary wave?

1. A100 Hz
2. B200 Hz
3. C300 Hz
4. D500 Hz

As printed in the paper