A-LevelPhysicsWavesMay/June 2023Paper 1 Q221 Mark

A source X emits a sound wave of constant frequency f. The wave is subsequently received at a stationary detector Y. The frequency of the wave that is detected by Y is less than f. What could be the reason for this?

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

The correct answer is C: X is moving away from Y..

Q: What topic does this question test?

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

ABetween X and Y, the wave undergoes diffraction.

BBetween X and Y, the wave undergoes reflection.

CX is moving away from Y.

DX is moving towards Y.

✓ Correct Answer

The correct answer is C: X is moving away from Y.

📋 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 May/June 2023 examination, Paper 1 Variant 2.

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