atmospheric sound refraction

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• 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

• Atmospheric refraction — is the deviation of light or other electromagnetic wave from a straight line as it passes through the atmosphere due to the variation in air density as a function of altitude. Atmospheric refraction near the ground produces mirages and can make… …   Wikipedia

• Atmospheric diffraction — is manifested in the following principal ways:* Fourier optics is the bending of light rays in the atmosphere, which results in remarkable visual displays of astronomical objects, such as depictions on this page.* Radio wave diffraction is the… …   Wikipedia

• Refraction — For the property of metals, see refraction (metallurgy). For the magic effect, see David Penn (magician). For the refraction in atmosphere, see Atmospheric refraction. Light on air–plexi surface in this experiment mainly undergoes refraction… …   Wikipedia

• Sound — This article is about audible acoustic waves. For other uses, see Sound (disambiguation). In a drum sound is produ …   Wikipedia

• Sound speed gradient — In acoustics, the sound speed gradient is the rate of change of the speed of sound with distance, for example with depth in the ocean,cite book title=Navy Supplement to the DOD Dictionary of Military and Associated Terms month=August year=2006… …   Wikipedia

• atmospheric refraction —       change in the direction of propagation of electromagnetic radiation or sound waves in traversing the atmosphere. Such changes are caused by gradients in the density of the air. See refraction. * * * …   Universalium

• Speed of sound — Sound is a vibration that travels through an elastic medium as a wave. The speed of sound describes how much distance such a wave travels in a certain amount of time. In SI Units with dry air at 20 °C (68 °F), the speed of sound is 343 m/s. This… …   Wikipedia

• John Kenneth Hilliard — Infobox Person name = John Kenneth Hilliard residence = Los Angeles, California; Anaheim, California other names = imagesize = caption =photo courtesy of Todd W. White birth date = October, 1901 birth place = Wyndmere, North Dakota birth name =… …   Wikipedia

• Refractive index — Refraction of light at the interface between two media. In optics the refractive index or index of refraction of a substance or medium is a measure of the speed of light in that medium. It is expressed as a ratio of the speed of light in vacuum… …   Wikipedia