A-LevelPhysicsSuperpositionMay/June 2019Paper 1 Q291 Mark
Monochromatic light is directed at a diffraction grating, as shown. [Figure 29.1] Which diagram could show all the possible directions of the light, after passing through the grating, that give maximum intensity?
A[Diagram A showing three diffracted beams, one central and two at equal angles on either side]
B[Diagram B showing multiple diffracted beams at increasing angles, with a wider angular spread]
C[Diagram C showing five diffracted beams, one central and two pairs at distinct equal angles on either side]
D[Diagram D showing only one beam continuing straight through]
✓ Correct Answer
The correct answer is C. This question tests the candidate's understanding of superposition within the Physicssyllabus. The examiner's mark scheme requires...
📋 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...
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