Physics (AS & A Level) · Oct / Nov 2018 · Paper 12 · Question 24
9702Stationary waves
The sound from a loudspeaker placed above a tube causes resonance of the air in the tube. A stationary wave is formed with two nodes and two antinodes as shown. The speed of sound in the air is 340 m s⁻¹. What is the frequency of the sound?
- A430 Hz
- B570 Hz
- C850 Hz
- D1700 Hz
As printed in the paper
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Correct answer: A. 430 Hz
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