A-LevelPhysicsWavesOct/Nov 2025Paper 1 Q271 Mark
A moving source emits sound of frequency 1200 Hz. A stationary observer hears sound of frequency 960 Hz. The speed of the sound is 340 ms⁻¹. What could be the velocity of the source?
A68 m s⁻¹ directly away from the observer
B68 m s⁻¹ directly towards the observer
C85 m s⁻¹ directly away from the observer
D85 m s⁻¹ directly towards the observer
✓ Correct Answer
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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