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 sample of hydrogen atoms is excited to and then returns to lower levels.
Total: 5 marks
(a) How many different spectral lines can be produced as the electron returns to the ground state through all possible paths? (2 marks)
(b) Name the series for transitions ending at and at . (2 marks)
(c) Which transition from emits the highest-energy photon? (1 mark)
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