Doppler whistle

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• Doppler principle — Doppler principle, Doppler s principle /dopˈlər(z) prinˈsi pl/ noun The law of change of wave frequency (Doppler effect or shift) when a source of vibrations is moving towards or from the observer, explaining the fall of pitch of a railway… …   Useful english dictionary

• Doppler's principle — Doppler principle, Doppler s principle /dopˈlər(z) prinˈsi pl/ noun The law of change of wave frequency (Doppler effect or shift) when a source of vibrations is moving towards or from the observer, explaining the fall of pitch of a railway… …   Useful english dictionary

• Doppler principleDoppler's principle — Doppler principle, Doppler s principle /dopˈlər(z) prinˈsi pl/ noun The law of change of wave frequency (Doppler effect or shift) when a source of vibrations is moving towards or from the observer, explaining the fall of pitch of a railway… …   Useful english dictionary

• Doppler , Christian Johann — (1803–1853) Austrian physicist Christian Doppler, the son of a stonemason from the Austrian city of Salzburg, studied mathematics at the Vienna Polytechnic. In 1835 he started teaching at a school in Prague and six years later was appointed… …   Scientists

• Train whistle — A train whistle or air whistle, (originally referred to as a steam trumpet), is an audible signaling device on a steam locomotive used to warn that the train is approaching, and to communicate with rail workers.The older steam whistles were… …   Wikipedia

• Mössbauer effect — Physics. the phenomenon in which an atom in a crystal undergoes no recoil when emitting a gamma ray, giving all the emitted energy to the gamma ray, resulting in a sharply defined wavelength. [1955 60; named after R. MÖSSBAUER] * * * ▪ physics… …   Universalium

• radar — /ray dahr/, n. 1. Electronics. a device for determining the presence and location of an object by measuring the time for the echo of a radio wave to return from it and the direction from which it returns. 2. a means or sense of awareness or… …   Universalium

• Bat species identification — TOCrightBat detectors are the most common way to identify the species of flying bats. There are distinct types of call which can indicate the genus, and variations in pattern and frequency which indicate the species. For readers not familiar with …   Wikipedia

• sound — sound1 soundable, adj. /sownd/, n. 1. the sensation produced by stimulation of the organs of hearing by vibrations transmitted through the air or other medium. 2. mechanical vibrations transmitted through an elastic medium, traveling in air at a… …   Universalium

• Sound — /sownd/, n. The, a strait between SW Sweden and Zealand, connecting the Kattegat and the Baltic. 87 mi. (140 km) long; 3 30 mi. (5 48 km) wide. Swedish and Danish, Oresund. * * * I Mechanical disturbance that propagates as a longitudinal wave… …   Universalium

• Ultrasound — Not to be confused with Supersonic .Ultrasound is cyclic sound pressure with a frequency greater than the upper limit of human hearing. Although this limit varies from person to person, it is approximately 20 kilohertz (20,000 hertz) in healthy,… …   Wikipedia