Long answer·Hard exam skill (4/5)·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 open pipe and a closed pipe have the same length and contain air at the same temperature.
Total: 3 marks
(a) Write the fundamental frequency of the open pipe. (1 mark)
(b) Write the fundamental frequency of the closed pipe. (1 mark)
(c) Compare the two fundamental frequencies. (1 mark)
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