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, find the depth of sea.
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Explanation:
As the speed of sound in sea water is 1400 m/s in the question, the distance traveled by sound(ultrasonic wave from the ship) in 1.5 seconds is calculated from the formula
D=v*t = 2100 m. This is twice the minimum distance between a source of sound (ship) and the reflector (sea bed) as it is reflected sound. So, the sea bed is at a distance of 1050 m at least from the ship. Therefore, the depth of the sea is 1.05 km.
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