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O-LevelPhysicsWaves5054/11 · May/June 2021 · Q251 Mark

The sound from a ship is reflected by a cliff. An echo is heard by a sailor on the ship 4.0 s after the sound is made. The speed of sound in air is 320 m/s. How far from the cliff is the ship?

A160 m
B640 m
C1280 m
D2560 m

✓ Correct answer

B: 640 m

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About this question

Topic
Waves, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source
O-Level Physics, May/June 2021 Paper 1 Variant 1, question 25.

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