On sending an ultrasonic wave from a ship towards the bottom of a sea, the time interval between sending the wave and receiving it back is found to be 1.5 s. If the velocity of wave in sea water is 1400 m s-1, find the depth of the sea.

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Depth of the sea = velocity × time/2 = 1400 × 1.5 / 2 = 1050 m

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