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 teacher labels three wafer, B is silicon doped with phosphorus, and C is silicon doped with boron. The class must identify which wafers are suitable for making the two sides of a p-n junction.
Total: 6 marks
(a) Which wafer is intrinsic? (1 mark)
(b) Which wafer is n-type? (1 mark)
(c) Which wafer is p-type? (1 mark)
(d) Which two wafers should be joined to form a p-n junction? (1 mark)
(e) Name the majority carriers in those two wafers. (2 marks)
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