Physics · May / June 2021 · Paper 12 · Question 28

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?

1. A160 m
2. B640 m
3. C1280 m
4. D2560 m

As printed in the paper