A miniature loudspeaker, initially at rest, falls vertically from a window in a high building. When the speaker has fallen a distance of 10.0m, it emits a very short pulse of sound of constant frequency 256 Hz in all directions. The pulse of sound, travelling at a speed of 330 ms¯¹, is heard by a person leaning out of the window.
Air resistance is negligible.
What is the frequency of the pulse of sound heard by the person?

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 Oct/Nov 2022 examination, Paper 1 Variant 2 (9702_w22_qp_12.pdf).

Question

A miniature loudspeaker, initially at rest, falls vertically from a window in a high building. When the speaker has fallen a distance of 10.0m, it emits a very short pulse of sound of constant frequency 256 Hz in all directions. The pulse of sound, travelling at a speed of 330 ms¯¹, is heard by a person leaning out of the window.
Air resistance is negligible.
What is the frequency of the pulse of sound heard by the person?

Oracle Prep · Accepted Answer

The correct answer is A: 246 Hz.

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