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 pulse on a string reaches a rigid wall and reflects. Another pulse reaches a light ring that can move freely at the end of a string.
Total: 4 marks
(a) Which reflection is inverted? (1 mark)
(b) What is the phase change at the rigid wall? (1 mark)
(c) Which end corresponds to a displacement antinode? (1 mark)
(d) Why does the rigid wall force a node? (1 mark)
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