Question

what do you mean by the word SONAR

Answer 1

Hi
SONAR means SOund Navigation And Ranging. It is a technique that uses sound propagation under water....

Answer 2

Hlo friend

Here is ur answer :

a method or device for detecting and locating objects especially underwater by means of sound waves sent out to be reflected by the objects; also :  a device for detecting the presence of a vessel (such as a submarine) by the sound it emits in water

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@sunita