Question

WHAT IS SONAR EXPLAIN IT????

Answer 1

Sonar is simply making use of an echo. When an animal or machine makes a noise, it sends sound waves into the environment around it. Those waves bounce off nearby objects, and some of them reflect back to the object that made the noise. ... The range of low-frequency sonar is remarkable.

Answer 2

Sonar (originally an acronym for soundnavigation ranging) is a technique that usessound propagation (usually underwater, as insubmarine navigation) to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels.Two types of technology share the name "sonar": passive sonar is essentially listening for the sound made by vessels;active sonar is emitting pulses of sounds and listening for echoes. Sonar may be used as a means of acoustic location and of measurement of the echo characteristics of "targets" in the water. Acoustic location in air was used before the introduction of radar. Sonar may also be used in air for robot navigation, and SODAR (an upward-looking in-air sonar) is used for atmospheric investigations. The term sonar is also used for the equipment used to generate and receive the sound. The acoustic frequencies used in sonar systems vary from very low (infrasonic) to extremely high (ultrasonic). The study of underwater sound is known as underwater acoustics or hydroacoustics.

The first recorded use of the technique was by Leonardo da Vinci in 1490 who used a tube inserted into the water to detect vessels by ear.] It was developed during World War I to counter the growing threat of submarine warfare, with an operational passive sonarsystem in use by 1918. Modern active sonar systems use an acoustic transponder to generate a sound wave which is reflected back from target objects.