WAEC - Physics (2002 - No. 30)
A pulse of a sound is transmitted from a ship and the reflection from the sea bed is recorded after 0.2s. Calculate the depth of the sea. [Take speed of sound in sea water = 1560ms-1]
312.0m
156.0m
78.0m
31.2m
Vysvětlení
x = \(\frac{vt}{2} = \frac{1560 \times 0.2}{2} = 156m\)