A-LevelPhysicsSuperpositionOct/Nov 2021Paper 1 Q301 Mark
Light of wavelength 5.5 × 10⁻⁷ m is incident normally on a diffraction grating. [Figure 30.1] The angle between the second-order diffraction maxima is 80°, as shown. What is the number of lines per metre of the diffraction grating?
A5.8 × 10⁵ lines per metre
B9.0 × 10⁵ lines per metre
C1.2 × 10⁶ lines per metre
D2.3 × 10⁶ lines per metre
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The correct answer is A. 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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