1.

A SONAR uses ultrasonic wavesto detectand locate objects under water. In asubmarineequipped with a sonarsends out ultrasound thatreturns exactly after 77 sec•Consider the speedof ultrasonic /ultrasound in water to be 1450m/s.Calculate the distance blu submarine and enemysubmarine.​

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ANSWER

Let the distance between the ship and the enemy SUBMARINE beS.

Speed of sound in WATER =1450m/s

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

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 =

2

1

×77=38.5s

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

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