A-LevelPhysicsSuperpositionMay/June 2023Paper 1 Q291 Mark
Green light of wavelength 550 nm is incident normally on a diffraction grating and produces a diffraction pattern on a screen placed 3.5 m from the diffraction grating. The third-order maximum on the screen is a distance of 0.75 m from the zeroth-order (central) maximum. [Figure 29.1] What is the distance between two adjacent slits in the diffraction grating?
A2.6 × 10⁻⁶ m
B7.7 × 10⁻⁶ m
C7.9 × 10⁻⁶ m
D1.0 × 10⁻⁵ m
✓ Correct Answer
The correct answer is C: 7.9 × 10⁻⁶ 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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