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?

Q: What is the correct answer to this A-Level Physics question?

The correct answer is D: 340 Hz.

Q: What topic does this question test?

This question tests Waves in A-Level Physics (syllabus code 9702). It is worth 1 mark.

A268 Hz

B300 Hz

C335 Hz

D340 Hz

✓ Correct Answer

The correct answer is D: 340 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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About This A-Level Physics Question

Topic

This multiple-choice question tests Waves in A-Level Physics (syllabus code 9702). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Physics Oct/Nov 2018 examination, Paper 1 Variant 2.

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