Physics (AS & A Level) · Oct / Nov 2019 · Paper 12 · Question 23

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?

1. A294 m s–1
2. B309 m s–1
3. C324 m s–1
4. D330 m s–1

As printed in the paper