A-LevelPhysicsWavesOct/Nov 2017Paper 1 Q251 Mark
A train that is moving in a straight line along a railway track has a whistle that continuously emits sound of frequency f. A woman standing by the side of the track hears sound of frequency 0.85f. The speed of sound in the air is 340 m s⁻¹. What is the velocity of the train?
A51 m s⁻¹ away from the woman
B51 m s⁻¹ towards the woman
C60 m s⁻¹ away from the woman
D60 m s⁻¹ towards the woman
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The correct answer is C. This question tests the candidate's understanding of waves within the Physicssyllabus. The examiner's mark scheme requires...
📋 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...
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