A source of sound is attached to a rope and then swung at a constant speed in a horizontal circle,
as illustrated in Fig. 5.1.
[Figure 5.1]
The source moves with a speed of 12.0ms⁻¹ and emits sound of frequency 951 Hz. The speed of
the sound in the air is 330ms⁻¹. An observer, standing a very long distance away from the source,
hears the sound.

Q: What topic does this question test?

This question tests Waves in A-Level Physics (syllabus code 9702). It is worth 4 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Physics Feb/Mar 2021 examination, Paper 2 Variant 2 (9702_m21_qp_22.pdf).

Question

A source of sound is attached to a rope and then swung at a constant speed in a horizontal circle,
as illustrated in Fig. 5.1.
[Figure 5.1]
The source moves with a speed of 12.0ms⁻¹ and emits sound of frequency 951 Hz. The speed of
the sound in the air is 330ms⁻¹. An observer, standing a very long distance away from the source,
hears the sound.

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