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is a technique that uses sound propagation (usually underwater) to navigate , communicate or to detect other vessels.

is an electronic method of using waves used to survey the ocean floor to detect objects and to navigate.

also used for the equipment used to generate and receive the sound.

The frequencies used in sonar systems vary from

The study of underwater sound is known as

is a mechanical wave that is an oscillation of pressure transmitted through a solid, liquid, or gas, composed of frequencies within the range of hearing and of a level sufficiently strong to be heard, or the sensation stimulated in organs of hearing by such vibrations.

The mechanical vibrations that can be interpreted as sound are able to travel through all forms of matter:

The matter that supports the sound is called the

Sound cannot travel through a

sounds with frequencies above 20,000 Vps. It cannot be heard by humans

Bats and some insects have highly developed ultrasound sensory organs that function up to approximately

vibrations are measured in

1 Hz is equivalent to

is the SI unit of frequency defined as the number of cycles per second of a periodic phenomenon. It is equivalent to cycles per second.

The hertz is named after the German physicist

who made important scientific contributions to the study of electromagnetism and was the one to conclusively prove the existence of electromagnetic waves