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
An electron beam used for matter-wave diffraction is accelerated through and then through in a second trial.
Total: 4 marks
(a) How does the electron momentum change from the first trial to the second? (1 mark)
(b) How does the de Broglie wavelength change? (1 mark)
(c) Explain the trend using the graph. (2 marks)
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