Physics (AS & A Level) · Feb / March 2020 · Paper 12 · Question 24

An observer is situated at the top of a tall tower. An aeroplane emitting sound at a frequency of 1000 Hz approaches the observer at a speed of 165 m s⁻¹. The speed of sound is 330 m s⁻¹. What is the frequency of the sound received by the observer?

1. A330 Hz
2. B667 Hz
3. C1000 Hz
4. D2000 Hz

As printed in the paper