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
A science exhibition has four counter, thermal camera, hospital bone imaging, and sterilisation lamp. Match each counter with the most suitable electromagnetic radiation and justify each match briefly.
Total: 6 marks
(a) Match radar speed sensing and thermal camera. (2 marks)
(b) Match bone imaging and sterilisation lamp. (2 marks)
(c) Write the four radiations in increasing frequency order. (2 marks)
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