A-LevelPhysicsSuperpositionMay/June 2025Paper 1 Q311 Mark

Light of a single wavelength is incident normally on a double slit. Interference fringes are observed on a screen. The distance from the double slit to the screen is 0.60 m and the fringe separation is 1.8 mm. The distance from the double slit to the screen increases by 0.90 m. What is the new fringe separation?

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

The correct answer is C: 4.5 mm.

Q: What topic does this question test?

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

A1.2 mm

B2.7 mm

C4.5 mm

D5.4 mm

✓ Correct Answer

The correct answer is C: 4.5 mm

📋 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 Superposition in A-Level Physics (syllabus code 9702). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Physics May/June 2025 examination, Paper 1 Variant 2.

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