Case study·Standard multi-step (3/5)·No calculator
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 set of hydrogen spectral lines has final level , another has final level , and a third has final level .
Total: 5 marks
(a) Name the first set. (1 mark)
(b) Name the second set. (1 mark)
(c) Name the third set. (1 mark)
(d) Which set lies in the visible region for hydrogen? (2 marks)
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