A-LevelPhysicsWavesOct/Nov 2016Paper 1 Q251 Mark
A man standing next to a stationary train hears sound of frequency 400 Hz emitted from the train's horn. The train then moves directly away from the man and sounds its horn when it has a speed of 50 m s⁻¹. The speed of sound is 340 m s⁻¹. What is the difference in frequency of the sound heard by the man on the two occasions?
A51 Hz
B69 Hz
C349 Hz
D469 Hz
✓ Correct Answer
The correct answer is A: 51 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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