Physics (AS & A Level) · Oct / Nov 2020 · Paper 13 · Question 25

The horn of a train emits sound of frequency f₁. While the horn is sounding, the train moves directly towards a stationary person. The speed of the train is 0.20v, where v is the speed of sound. The frequency of the sound heard by the person is f₂. What is the ratio f₁/f₂?

1. A0.80/1
2. B1/1.2
3. C1.2/1
4. D1/0.80

As printed in the paper