Physics (AS & A Level) · May / June 2017 · Paper 13 · Question 24

A high-speed train approaches a stationary observer at a speed of 80 m s⁻¹. The train's horn emits a sound of frequency 250 Hz. The speed of sound is 340 m s⁻¹. What is the observed frequency of the sound from the horn?

1. A190 Hz
2. B200 Hz
3. C310 Hz
4. D330 Hz

As printed in the paper