A-LevelPhysicsSuperposition9702/12 · Feb/Mar 2021 · Q231 Mark

A loudspeaker emitting a sound wave of a single frequency is placed a distance L from a reflecting surface, as shown. [Figure 23.1] A stationary wave is formed with an antinode at the loudspeaker. A microphone is moved from the loudspeaker to the reflector. Before the microphone reaches the reflector, it detects four points where the sound intensity is a minimum. What is the wavelength of the sound wave?

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A2L / 9

B2L / 8

C4L / 9

D4L / 8

✓ Correct answer

C: 4L / 9

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Topic: Superposition, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Feb/Mar 2021 Paper 1 Variant 2, question 23.

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