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(a) In measuring the depth of sea/ocean.

(b) For the detection of the position of any objects, such as shipwrecks, sea rocks, hidden ice-berg in the sea and ocean.

(c) Investigating any problem inside the human body.

For above mentioned purposes, sound of high frequency is produced so that reflections can be received from various surfaces. The time taken for reception of reflected sound waves is analyzed by a computer to detect the problem.