Case study·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
A student compares a tuning fork of unknown frequency with a standard fork of . The two forks produce beats per second. When a small piece of wax is attached to the unknown fork, the beat frequency decreases to .
Total: 4 marks
(a) What are the two possible original frequencies? (1 mark)
(b) What does adding wax do to the fork frequency? (1 mark)
(c) Determine the original frequency of the unknown fork. (2 marks)
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