A-LevelPhysicsSuperposition9702/12 · Oct/Nov 2021 · Q241 Mark

A sound wave from a loudspeaker is reflected back along its original path by a reflector. A microphone is initially at point X where the sound intensity is a minimum, as shown. [Figure 24.1] The microphone is moved towards the reflector and passes through four more intensity minima until reaching a fifth minimum at point Y. The distance XY is 70.0 cm. What is the wavelength of the sound?

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A11.7 cm

B14.0 cm

C23.3 cm

D28.0 cm

✓ Correct answer

D: 28.0 cm

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Topic: Superposition, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2021 Paper 1 Variant 2, question 24.

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