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 school sets up an electromagnetic-spectrum display. Station P transmits audio programmes to receivers far away. Station Q detects warm objects in darkness. Station R checks luggage by forming shadow images of dense objects. Station S disinfects a small closed box under supervision.
Total: 5 marks
(a) Identify the radiation used at P and Q. (2 marks)
(b) Identify the radiation used at R and S. (2 marks)
(c) Which of these four has the highest frequency? (1 mark)
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