Case study·Standard multi-step (3/5)·Calculator allowed
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Question
A Young's double-slit experiment is performed with slit separation and screen distance . Monochromatic light of wavelength is used.
Total: 5 marks
(a) Find the fringe width. (2 marks)
(b) Find the distance of the second bright fringe from the central maximum. (1 mark)
(c) State what happens to the fringe width if the wavelength is decreased. (2 marks)
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