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Physics (AS & A Level) · Oct / Nov 2025 · Paper 12 · Question 31

9702Interference

A student connects two loudspeakers to a signal generator. As the student walks from P to Q, he notices that the loudness of the sound rises and falls repeatedly. What causes the loudness of the sound to vary?

  1. Adiffraction of the sound waves
  2. BDoppler shift of the sound waves
  3. Cinterference of the sound waves
  4. Dreflection of the sound waves

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Correct answer: C. interference of the sound waves

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