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A-LevelPhysicsWaves9702/12 · Oct/Nov 2019 · Q231 Mark

A loudspeaker emitting a constant frequency of 2000 Hz is swung in a horizontal circle with a speed of 15.0 m s⁻¹. A stationary observer is level with the loudspeaker and situated a long distance from the loudspeaker. The observer hears a sound of varying frequency. The maximum frequency heard is 2097 Hz. What is the speed of the sound in the air?

A294 m s⁻¹

B309 m s⁻¹

C324 m s⁻¹

D330 m s⁻¹

✓ Correct answer

C: 324 m s⁻¹

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About this question

Topic: Waves, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2019 Paper 1 Variant 2, question 23.

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