Question

A ship sends out a sound wave and receives an echo after 2 seconds. If the speed in water is 800m/s. What is the depth of the sea at that time?

Answer 1

Explanation:

speed=distance/time,

Answer 2

Correct option is

B

750m

Velocity of sound in water  v=1500 m/s

Let the depth of sea be x.

The sound has to travel to the bottom of the sea and get reflected back to the ship itself, thus total distance traveled by the sound is  2x.

Time taken to hear an echo  t=1 s

So,  2x=vt

Or  2x=1500×1

⟹ x=750 m