A sonar device on a submarine sends out a signal and receives an echo 5 s later. Calculate the speed of sound in water if the distance of the object from the submarine is 3625 m.

Given,

Time taken = 5 seconds

The time taken by ultrasound signal to travel from the submarine to the object will be half of this time:

=

= 2.5 seconds

We know that,

Speed =

=

= 1450 m/s

Therefore, the speed of sound is 1450 m/s.