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Physics (AS & A Level) · May / June 2026 · Paper 12 · Question 28

9702Stationary waves

A stationary sound wave is formed in a tube of length L that is closed at one end. The diagram shows the positions of the nodes and antinodes of the stationary wave. Which graph shows the variation of the amplitude a of the wave with distance x measured from the closed end of the tube?

  1. Agraph A
  2. Bgraph B
  3. Cgraph C
  4. Dgraph D

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Correct answer: A. graph A

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