1.

A Sonar device on a submarine send a signal to the object underwater and receive and Eco after 8 seconds find the distance of the object from submarine speed on the sound in water is 1500 M per second

Answer»

time take to receive ECHO = 8s(v) SPEED of sound in water = 1500m/sdistance of object of the object from submarine = 2d bcoz in sonar the tansmitter FIRSTLY emits the sound wave and then sound reflects back to the ship which is received by transmitter so distance travelled will be 2 times that is 2dv = d/tv×t=2d1500×8=2d120,00/2 =d6000 m = dhence distance travelled is 6000 m



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