A-LevelPhysicsWaves9702/12 · Oct/Nov 2017 · Q251 Mark
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?
A51 m s⁻¹ away from the woman
B51 m s⁻¹ towards the woman
C60 m s⁻¹ away from the woman
D60 m s⁻¹ towards the woman
✓ Correct answer
C: 60 m s⁻¹ away from the woman
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