Question

In a submarine equipped with sonar,
the time delay between the generation
of a pulse and its echo after reflection
from an enemy submarine is observed
to be 80 s. If the speed of sound in water
is 1460 ms. What is the distance of
enemy submarine?
Ans: (58.40 km)​

Answer 1

Explanation:

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Let the distance between the ship and the enemy submarine be ‘S’.

Speed of sound in water = 1450 m/s

Time lag between transmission and reception of Sonar waves = 77 s

In this time lag, sound waves travel a distance which is twice the distance between the ship and the submarine (2S).

Time taken for the sound to reach the submarine

=1/2 × 77 =38.5 s

Distance between the ship and the submarine (S) = 1450 × 38.5 = 55825 m = 55.8 km

I hope, this will help you

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