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?

Q: What topic does this question test?

This question tests Waves in A-Level Physics (syllabus code 9702). It is worth 1 mark.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Physics Feb/Mar 2022 examination, Paper 1 Variant 2 (9702_m22_qp_12.pdf).

Question

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?

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The correct answer is C: 91 Hz.

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