A-LevelPhysicsSuperpositionOct/Nov 2018Paper 1 Q301 Mark
A parallel beam of monochromatic light of wavelength λ is incident normally on a diffraction grating G. The angle between the directions of the two second-order diffracted beams at P₁ and at P₂ is α, as shown. [Figure 30.1] What is the spacing of the lines on the grating?
A2λ / sin α
Bλ / sin α
C2λ / sin(α/2)
Dλ / sin(α/2)
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The correct answer is C. This question tests the candidate's understanding of superposition within the Physicssyllabus. The examiner's mark scheme requires...
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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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