Physics (AS & A Level) · Oct / Nov 2017 · Paper 12 · Question 25

A train that is moving in a straight line along a railway track has a whistle that continuously emits sound of frequency f. A woman standing by the side of the track hears sound of frequency 0.85f. The speed of sound in the air is 340 m s⁻¹. What is the velocity of the train?

1. A51 m s⁻¹ away from the woman
2. B51 m s⁻¹ towards the woman
3. C60 m s⁻¹ away from the woman
4. D60 m s⁻¹ towards the woman

As printed in the paper