A-LevelPhysicsWavesOct/Nov 2018Paper 1 Q251 Mark
A police car has a two-tone siren emitting sound of frequencies of 700 Hz and 1000 Hz. The police car is travelling at a speed of 40.0 m s⁻¹ towards a stationary observer. The speed of sound in the air is 340 m s⁻¹. What is the difference between the two frequencies of the sound that is heard by the observer?
A268 Hz
B300 Hz
C335 Hz
D340 Hz
✓ Correct Answer
The correct answer is D. 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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