(i) What is the principle on which SONAR is based ?(ii) An observer st

1.	(i) What is the principle on which SONAR is based ?(ii) An observer stands at a certain distance away from a cliff and produces a loud sound. He hears the echo of the sound after 1.8s. Calculate the distance between the cliff and the observer if the velocity of sound in air is 340 ms.
Answer» (i) Principle of SONAR is based on echo. (ii) Given : v = 340 m/s, t = 1.8s Distance travelled by sound = 2d Distance = speed x Time 2d = v x t d = (v x t)/2 = (340 x 1.8)/2 = 170 x 1.8 = 306 m.

(i) What is the principle on which SONAR is based ?(ii) An observer stands at a certain distance away from a cliff and produces a loud sound. He hears the echo of the sound after 1.8s. Calculate the distance between the cliff and the observer if the velocity of sound in air is 340 ms.

Answer»

(i) Principle of SONAR is based on echo.

(ii) Given : v = 340 m/s, t = 1.8s

Distance travelled by sound = 2d

Distance = speed x Time

2d = v x t

d = (v x t)/2

= (340 x 1.8)/2

= 170 x 1.8

= 306 m.