A-LevelPhysicsWaves9702/12 · May/June 2017 · Q251 Mark
An ambulance travels along a straight road at a speed of 30.0 ms⁻¹. Its siren emits sound of frequency 2000 Hz. The speed of sound in the air is 340 ms⁻¹. The ambulance passes a man standing at the side of the road. What is the frequency of the sound heard by the man as the ambulance moves towards him and as the ambulance moves away from him? [Table with columns: frequency heard as ambulance moves towards man/Hz, frequency heard as ambulance moves away from man/Hz. Rows for A, B, C, D show different values.]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Atowards: 1820, away: 2180
Btowards: 1840, away: 2190
Ctowards: 2180, away: 1820
Dtowards: 2190, away: 1840
✓ Correct answer
D: towards: 2190, away: 1840
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