A-LevelPhysicsSuperpositionOct/Nov 2024Paper 1 Q301 Mark
The diagram shows visible light incident normally on a diffraction grating. [Figure 30.1] A pattern of intensity maxima forms on the screen. A line connecting the centre of the fourth order intensity maximum with the centre of the diffraction grating forms an angle of 53° with the centre line. The grating has a line spacing of 2.7 × 10⁻⁶ m. What is the wavelength of the incident light?
A4.1 x 10⁻⁷ m
B5.4 × 10⁻⁷ m
C1.6 × 10⁻⁶ m
D2.2 × 10⁻⁶ m
✓ Correct Answer
The correct answer is B: 5.4 × 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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