Physics (AS & A Level) · May / June 2024 · Paper 12 · Question 22

A loudspeaker is playing music in a room. The door to the room is open and has a width of 0.80 m. Sound waves of many different frequencies pass through the doorway and diffract. The speed of sound in air is 340 m s⁻¹. Which frequency of sound wave diffracts the most as it passes through the doorway?

1. A2.4 × 10⁻³ Hz
2. B8.0 × 10⁻¹ Hz
3. C2.7 × 10² Hz
4. D4.3 × 10² Hz

As printed in the paper