A-LevelPhysicsSuperpositionFeb/Mar 2018Paper 1 Q271 Mark
Monochromatic light is incident on a pair of narrow slits a distance of 0.1 mm apart. A series of bright and dark fringes are observed on a screen a distance of 2.0 m away. The distance between adjacent bright fringes is 8.0 mm. [Figure 27.1] What is the path difference between the light waves from the two slits that meet at the second order dark fringe?
A2.0 x 10⁻⁷ m
B4.0 x 10⁻⁷ m
C6.0 x 10⁻⁷ m
D8.0 x 10⁻⁷ m
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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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