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Physics (AS & A Level) · May / June 2025 · Paper 14 · Question 21

9702Transverse and longitudinal waves

A progressive longitudinal wave is travelling horizontally from left to right. A graphical representation of the wave at one instant in time is shown. Which row could give the correct labels for the x-axis and y-axis of this graph?

  1. Ax-axis: distance; y-axis: displacement of particles to the right
  2. Bx-axis: distance; y-axis: displacement of particles upwards
  3. Cx-axis: time; y-axis: displacement of particles to the right
  4. Dx-axis: time; y-axis: displacement of particles upwards

As printed in the paper

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Correct answer: A. x-axis: distance; y-axis: displacement of particles to the right

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