A-LevelPhysicsWavesMay/June 2024Paper 1 Q221 Mark
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?
A2.4 × 10⁻³ Hz
B8.0 × 10⁻¹ Hz
C2.7 × 10² Hz
D4.3 × 10² Hz
✓ Correct Answer
The correct answer is D: 4.3 × 10² Hz
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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