A-LevelPhysicsSuperposition9702/12 · May/June 2018 · Q261 Mark

The diagram shows apparatus for the measurement of the frequency of a sound wave. [Diagram] Sound of the unknown frequency is reflected back from a metal plate. A microphone placed at a distance D from the metal plate detects the sound intensity. A minimum intensity is detected with D = 12.0 cm. The plate is moved further away from the microphone until the next minimum is detected with D = 15.0 cm. The speed of sound in air is 336 ms⁻¹. What is the frequency of the sound?

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A56 Hz

B112 Hz

C5600 Hz

D11200 Hz

✓ Correct answer

C: 5600 Hz

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Topic: Superposition, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2018 Paper 1 Variant 2, question 26.

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