JAMB - Physics (1985 - No. 25)
In order to find the depth of the sea, a ship sends out a sound wave and receives an echo after one second. If the velocity of sound in water is 1500ms-1, what is the depth of the sea?
0.75km
1.50km
2.20km
3.00km
3.75km
Vysvětlení
Echo time = 1 \(\div\) 2 = 0.5sec
depth = velocity x time
= 1500 x 0.5
= 750m = 0.75km
depth = velocity x time
= 1500 x 0.5
= 750m = 0.75km