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Physics (AS & A Level) · May / June 2023 · Paper 12 · Question 26

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. [diagram: tube of height 60 cm with loudspeaker above] The tube has height 60 cm. The speed of sound in the air is 340 m s⁻¹. What is the frequency of the sound?

  1. A430 Hz
  2. B570 Hz
  3. C850 Hz
  4. D1700 Hz

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Correct answer: A. 430 Hz

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