Physics (AS & A Level) · May / June 2025 · Paper 11 · Question 31
9702Stationary waves
A hollow tube is closed at one end and open at the other. A stationary sound wave of the lowest possible frequency, 820 Hz, is produced in the tube. The speed of sound in air is 330 m s⁻¹. What is the length of the tube?
- A10 cm
- B20 cm
- C40 cm
- D160 cm
As printed in the paper
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Correct answer: A. 10 cm
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