A-LevelPhysicsSuperpositionOct/Nov 2011Paper 1 Q281 Mark

Two light sources produce visible interference fringes only in certain circumstances. Which condition enables visible interference fringes to be formed?

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

The correct answer is A: using a white light source.

Q: What topic does this question test?

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

Ausing a white light source

Busing incoherent sources

Cusing one light source which is polarised at right angles to light from the other source

Dusing sources from which the light does not overlap

✓ Correct Answer

The correct answer is A: using a white light source

📋 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 2011 examination, Paper 1 Variant 2.

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