A-LevelPhysicsSuperpositionOct/Nov 2022Paper 1 Q301 Mark
Red light of a single wavelength passes through a diffraction grating. Bright dots are formed on a screen, as shown. [Figure showing bright dots on a screen from diffraction grating] The red light is replaced with white light. Which diagram, drawn to the same scale, shows a possible pattern of bright light on the screen?
A[Diagram option A]
B[Diagram option B]
C[Diagram option C]
D[Diagram option D]
✓ Correct Answer
The correct answer is D: [Diagram option D]
📋 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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