The ultrasonic waves take 4 seconds to travel from the ship to the bottom of the sea and back. The depth of sea is (speed of sound in mater is 1500 m/s ) .................

The time taken by the waves to travel from the ship to bottom of the sea =42= 2secSpeed = distance timedistance =Speed×time             = 1500×2=3000 m                                                                                                          

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