A-LevelPhysicsWavesFeb/Mar 2020Paper 1 Q241 Mark

An observer is situated at the top of a tall tower. An aeroplane emitting sound at a frequency of 1000 Hz approaches the observer at a speed of 165 ms¯¹. The speed of sound is 330 ms¯¹. What is the frequency of the sound received by the observer?

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

The correct answer is D: 2000 Hz.

Q: What topic does this question test?

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

A330 Hz

B667 Hz

C1000 Hz

D2000 Hz

✓ Correct Answer

The correct answer is D: 2000 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 Feb/Mar 2020 examination, Paper 1 Variant 2.

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