Long answer·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
Bohr's model successfully explained the spectrum of hydrogen but failed as a complete atomic model.
Total: 5 marks
(a) State two postulates of Bohr's model that explain discrete spectra. (2 marks)
(b) Explain why emission lines are discrete in this model. (2 marks)
(c) State one limitation of Bohr's model. (1 mark)
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