Physics (AS & A Level) · Oct / Nov 2023 · Paper 12 · Question 22

A source of sound waves is moving at a constant speed directly towards a stationary observer. The sound waves have a speed of 340 m s⁻¹ and a frequency of 480 Hz. The observer hears sound waves of frequency 650 Hz. What is the speed of the source?

1. A89 m s⁻¹
2. B120 m s⁻¹
3. C250 m s⁻¹
4. D340 m s⁻¹

As printed in the paper