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Physics (AS & A Level) · Oct / Nov 2021 · Paper 11 · Question 23

9702Stationary waves

A glass tube is closed at one end and has a loudspeaker at the other end. A stationary wave is formed with a node at the closed end of the tube when the sound has frequency f0. There are no other nodes. The frequency of the sound is then slowly increased. What is the frequency of the sound that produces the next stationary wave?

  1. A1.25f0
  2. B1.50f0
  3. C2.00f0
  4. D3.00f0

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Correct answer: D. 3.00f0

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