Sonar and Sound

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Difference between Sonar and Sound

Sonar vs. Sound

Sonar (originally an acronym for SOund Navigation And Ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels. In physics, sound is a vibration that typically propagates as an audible wave of pressure, through a transmission medium such as a gas, liquid or solid.

Bulk modulus

The bulk modulus (K or B) of a substance is a measure of how resistant to compressibility that substance is.

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Density

The density, or more precisely, the volumetric mass density, of a substance is its mass per unit volume.

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Doppler effect

The Doppler effect (or the Doppler shift) is the change in frequency or wavelength of a wave in relation to observer who is moving relative to the wave source.

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Echo

In audio signal processing and acoustics, Echo is a reflection of sound that arrives at the listener with a delay after the direct sound.

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Frequency

Frequency is the number of occurrences of a repeating event per unit of time.

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Hertz

The hertz (symbol: Hz) is the derived unit of frequency in the International System of Units (SI) and is defined as one cycle per second.

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Infrasound

Infrasound, sometimes referred to as low-frequency sound, is sound that is lower in frequency than 20 Hz or cycles per second, the "normal" limit of human hearing.

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Marine mammal

Marine mammals are aquatic mammals that rely on the ocean and other marine ecosystems for their existence.

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Navigation

Navigation is a field of study that focuses on the process of monitoring and controlling the movement of a craft or vehicle from one place to another.

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Parametric array

A parametric array, in the field of acoustics, is a nonlinear transduction mechanism that generates narrow, nearly side lobe-free beams of low frequency sound, through the mixing and interaction of high frequency sound waves, effectively overcoming the diffraction limit (a kind of spatial 'uncertainty principle') associated with linear acoustics.

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Pressure

Pressure (symbol: p or P) is the force applied perpendicular to the surface of an object per unit area over which that force is distributed.

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Reflection (physics)

Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated.

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Refraction

Refraction is the change in direction of wave propagation due to a change in its transmission medium.

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Reverberation

Reverberation, in psychoacoustics and acoustics, is a persistence of sound after the sound is produced.

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Speed of sound

The speed of sound is the distance travelled per unit time by a sound wave as it propagates through an elastic medium.

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Ultrasound

Ultrasound is sound waves with frequencies higher than the upper audible limit of human hearing.

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Underwater acoustics

Underwater acoustics is the study of the propagation of sound in water and the interaction of the mechanical waves that constitute sound with the water and its boundaries.

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Vibration

Vibration is a mechanical phenomenon whereby oscillations occur about an equilibrium point.

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Wave

In physics, a wave is a disturbance that transfers energy through matter or space, with little or no associated mass transport.

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