Question

to what use sonar is put in the sea ? Explain clearly.

this is a question from book named - Elementary Physics Class 8..​

Answer 1

Sonar (sound navigation and ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels. ... The study of underwater sound is known as underwater acoustics or hydroacoustics.

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Answer 2

Sonar uses sound waves to 'see' in the water.

NOAA scientists primarily use sonar to develop nautical charts, locate underwater hazards to navigation, search for and map objects on the seafloor such as shipwrecks, and map the seafloor itself.