A-LevelPhysicsWavesFeb/Mar 2024Paper 1 Q261 Mark
A source of sound waves with constant frequency moves towards a stationary observer. The observer compares the sound waves arriving at the observer's position with the waves emitted by the source of sound. What is detected by the observer?
Adecreased frequency of the sound waves
Bno change in frequency of the sound waves
Cdecreased wavelength of the sound waves
Dno change in wavelength of the sound waves
✓ Correct Answer
The correct answer is C: decreased wavelength of the sound waves
📋 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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