Physics (AS & A Level) · May / June 2024 · Paper 12 · Question 21

A man stands stationary in front of a swing. A child sits and swings. The child blows a whistle that emits a sound at a constant frequency. The man observes the frequency of the sound when the swing is at positions X, Y and Z. When will the man hear the highest frequency?

1. Awhen the swing is at X
2. Bwhen the swing is at Y and moving away from the man
3. Cwhen the swing is at Y and moving towards the man
4. Dwhen the swing is at Z

As printed in the paper