A-LevelPhysicsSuperpositionMay/June 2019Paper 1 Q311 Mark

A student sets up apparatus to observe the double-slit interference of monochromatic light, as shown. [Figure 31.1] Interference fringes are formed on the screen. Which change would increase the distance between adjacent fringes?

Q: What topic does this question test?

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

ADecrease the distance between the two slits.

BDecrease the width of each slit.

CMove the screen closer to the double slit.

DUse light of a higher frequency.

✓ Correct Answer

The correct answer is A: Decrease the distance between the two slits.

📋 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 2019 examination, Paper 1 Variant 2.

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