A-LevelPhysicsSuperpositionMay/June 2016Paper 1 Q281 Mark
Coherent light passes through a double slit, producing bright and dark fringes on a screen placed parallel to the plane of the double slit. The intensity of the light from each of the slits is initially the same. The intensity of the light passing through one of the slits in the double slit is now increased. The frequency of the light remains constant. What is the effect on the appearance of the fringes on the screen?
Aseparation of fringes: decreases, maximum intensity of dark fringes: no change
Bseparation of fringes: increases, maximum intensity of dark fringes: greater
Cseparation of fringes: no change, maximum intensity of dark fringes: greater
Dseparation of fringes: no change, maximum intensity of dark fringes: no change
✓ Correct Answer
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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