Question

on sending an ultrasonic wave from a ship towards the bottom of the sea the time interval between sending of the wave and receiving it back is found to be 1.5 seconds if the velocity of wave in sea water is 1400 metres per second find the depth of the sea

Answer 1

Depth of sea = velocity × time/2
                     = 1400 × 1.5/2
                     = 2100/2
                     = 1050
∴ Depth of sea = 1050 m

Answer 2

v=1400 m/s

t=1.5 s

$depth \: of \: sea = \frac{v \times t}{2}$

$= \frac{1400 \times 1.5}{2}$

$= \frac{2100}{2}$

$= 1050$

hope it will help you......