Question

Question no. 12 plz.

Answer 1

the technique used was SONAR
the principle of this technique is used to find the depth of sea

Answer 2

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a) the technique depicited here is the SONAR.

b) the principle of this technique is the recording the time taken by ultrasonic wave to come to the transmitter after striking and through this calculating the distance between the sea level to the seabed.

c) two application of this technique are finding the distance of the seabed and secondly finding any object or enemy near ship.