Physics (AS & A Level) · Oct / Nov 2020 · Paper 11 · Question 24

A source of sound of frequency 1000 Hz directly approaches a stationary observer. The observer measures the frequency of the received sound to be 1500 Hz. The speed of sound in still air is 330 m s⁻¹. What is the speed of the source of sound?

1. A110 m s⁻¹
2. B165 m s⁻¹
3. C220 m s⁻¹
4. D330 m s⁻¹

As printed in the paper