O-LevelPhysicsWaves5054/12 · Oct/Nov 2015 · Q271 Mark
The sound from the siren of a ship is reflected by a cliff. An echo is heard by a sailor on the deck of the ship, 4.0s after the siren is sounded. The speed of sound in air is 320 m/s. How far from the cliff is the ship?
A80 m
B160 m
C640 m
D1280 m
✓ Correct answer
C: 640 m
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