SONAR

The video tutorial explains how fishing boats and submarines use sonar technology to locate fish and navigate the ocean. Sonar, which stands for sound navigation and ranging, uses sound waves to detect objects underwater. It consists of a transmitter and a receiver, and operates on the principle of echo ranging. Sonar uses ultrasound frequencies, which are above 20,000 Hertz, to avoid interference from other sounds. The tutorial also covers how sonar calculates the depth of the ocean floor by measuring the time it takes for sound waves to travel to the ocean floor and back, using the speed of sound in water.

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