Question
What apparatus is used to locate a submerged object?
Solution
Sonar (originally an acronym for Sound Navigation And Ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate,communicatewithordetectobjectson or under the surface of the water, such as other vessels.Twotypesoftechnologysharethename "sonar":passivesonarisessentiallylisteningfor the sound made by vessels; active sonar is emitting pulses of sounds and listening for echoes.
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 SELECT department, COUNT (employee_id)Â
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