A-LevelPhysicsSuperpositionFeb/Mar 2024Paper 1 Q311 Mark
A student sets up an experiment to investigate double-slit interference. The student uses light of a single wavelength from a laser to illuminate a double slit so that a pattern of interference fringes is observed on the screen. [Figure showing a double-slit experiment setup with laser, double slit, screen, and distances p, r, q] The student finds that the fringes are very close together. What could the student decrease in order to increase the separation of the fringes on the screen?
Athe distance p from the laser to the double slit
Bthe distance q from the double slit to the screen
Cthe separation r of the slits
Dthe wavelength of the light from the laser
✓ Correct Answer
The correct answer is C: the separation r of the slits
📋 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...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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