A-LevelPhysicsSuperpositionFeb/Mar 2018Paper 1 Q271 Mark
Monochromatic light is incident on a pair of narrow slits a distance of 0.1 mm apart. A series of bright and dark fringes are observed on a screen a distance of 2.0 m away. The distance between adjacent bright fringes is 8.0 mm. [Figure 27.1] What is the path difference between the light waves from the two slits that meet at the second order dark fringe?
A2.0 x 10⁻⁷ m
B4.0 x 10⁻⁷ m
C6.0 x 10⁻⁷ m
D8.0 x 10⁻⁷ m
✓ Correct Answer
The correct answer is C: 6.0 x 10⁻⁷ m
📋 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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