A-LevelPhysicsWaves9702/12 · Feb/Mar 2022 · Q221 Mark
The warning signal on an ambulance has a frequency of 600 Hz. The speed of sound is 330 ms⁻¹. The ambulance is travelling with a constant velocity of 25 ms⁻¹ towards an observer. The ambulance passes, and then moves away from the observer with no change in velocity. [Figure 22.1] Which overall change in observed frequency takes place between the times at which the ambulance is a long way behind the observer and when it is a long way in front of the observer?
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.
A49 Hz
B84 Hz
C91 Hz
D98 Hz
✓ Correct answer
C: 91 Hz
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