A-LevelPhysicsSuperpositionOct/Nov 2020Paper 1 Q291 Mark

An experiment is carried out to demonstrate double-slit interference using light of wavelength 500 nm. The distance between bright fringes in the interference pattern is 5 mm. What are possible values for the distance between the slits and the screen, and the slit separation?

Q: What topic does this question test?

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

Aslit-screen distance: 50 cm, slit separation: 0.5 mm

Bslit-screen distance: 50 cm, slit separation: 5 mm

Cslit-screen distance: 5 m, slit separation: 0.5 mm

Dslit-screen distance: 5 m, slit separation: 5 mm

✓ Correct Answer

The correct answer is C: slit-screen distance: 5 m, slit separation: 0.5 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 Oct/Nov 2020 examination, Paper 1 Variant 2.

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