O-LevelPhysicsWavesOct/Nov 2025Paper 1 Q181 Mark
The sentences describe sound waves. Three words have been omitted. Sound waves are longitudinal waves that consist of regions of higher pressure called ......1...... and regions of lower pressure called ......2....... An echo occurs when a sound wave is ......3....... Which words complete gaps 1, 2 and 3?
A1
compressions
2
rarefactions
3
reflected
B1
compressions
2
rarefactions
3
refracted
C1
rarefactions
2
compressions
3
refracted
D1
rarefactions
2
compressions
3
reflected
✓ Correct Answer
The correct answer is A: 1 compressions 2 rarefactions 3 reflected
📋 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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