A-LevelPhysicsSuperposition9702/12 · Oct/Nov 2013 · Q291 Mark

A student connects two loudspeakers to a signal generator. [Figure 29.1] 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?

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Adiffraction of the sound waves

Binterference of the sound waves

Cpolarisation of the sound waves

Dreflection of the sound waves

✓ Correct answer

B: interference of the sound waves

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Topic: Superposition, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2013 Paper 1 Variant 2, question 29.

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