A-LevelPhysicsSuperpositionOct/Nov 2019Paper 1 Q281 Mark
An electromagnetic wave is incident normally on a diffraction grating. A second-order maximum is produced at an angle of 30° to a normal to the grating. The grating has 5000 lines per cm. What is the wavelength of the wave?
A2.5 × 10⁻⁷ m
B5.0 × 10⁻⁷ m
C1.0 × 10⁻⁶ m
D5.0 × 10⁻⁵ m
✓ Correct Answer
The correct answer is B. 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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