Physics (AS & A Level) · Oct / Nov 2022 · Paper 12 · Question 24

A miniature loudspeaker, initially at rest, falls vertically from a window in a high building. When the speaker has fallen a distance of 10.0 m, 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 m s–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?

1. A246 Hz
2. B249 Hz
3. C267 Hz
4. D313 Hz

As printed in the paper