Question

explain sonar
and it's working....​

Answer 1

☞SONAR :-

Sound Navigation and Ranging, is helpful for exploring and mapping the ocean because sound waves travel farther in the water than do radar and light waves

• used by echo.
• a technique that uses sound propagation to communicate, navigate and to find the depth of the sea water.
• also used to find the distance of the other objects in sea water .

☞How does it work....?

when an animal or machine makes a noise , it sends the sound waves into the environment around it . Those waves bounces back to nearby objects, and some of them reflect back to the object that produces sound.

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☞MoRe to know......

• SONAR if used by some fishes to catch its prey.

• fishes produces Sonar waves and after some time it bounces back to the fishes, due to this they are able know the distance of their prey .

• example :- Dolphins.

Answer 2

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SONAR stands for sound navigation and ranging . SONAR is a device which is used by ships and submarines to locate position of other vessels in the ocean. These are of two types. One is passive, which only detects the incoming. Another one is active SONAR which transmits sound pulses and detects the reflected echoes to detect presence of other sea vessels.

Principle behind SONAR is reflection of sound.

The sound sent is reflected back from the sea bed which is known as echo.

Let the depth of the ocean be D

For perpendicular focusing of the sonar

V = 2D/t

=>D = Vt/2

Where V = speed of sound in water

t = time after the echo is detected.

Thus, depth of the ocean is evaluated.

Sonar is a very useful technique which can help determine what lies beneath the ship, boat or a submarine. It has been used to discover shipwrecks, lost treasures, sunken features etc.

It is also used in military for detecting the presence of enemy ships .