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 boat sends a sound pulse vertically downward in water and receives the reflected pulse after . The speed of sound in water is .
Total: 4 marks
(a) Find the total distance travelled by the pulse. (1 mark)
(b) Find the depth of water below the boat. (1 mark)
(c) Why is the depth half the total distance? (1 mark)
(d) Name the principle used in echolocation. (1 mark)
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