The sound velocities of some

См. также в других словарях:

• The Mote in God's Eye —   …   Wikipedia

• 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

• Plutonium in the environment — is an article which is part of the actinides in the environment series. Almost all plutonium present in the environment is due to human activity because the majority of plutonium isotopes are shortlived on a geological timescale.… …   Wikipedia

• Comparison of the AK-47 and M16 — M16 (top) and AK 47 (bottom) assault rifles Firearm AK 47 M16A1 Manufacturer Izhmash ArmaLite, Colt …   Wikipedia

• 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

• Acousto-optics — is a branch of physics that studies the interactions between sound waves and light waves, especially the diffraction of laser light by ultrasound or sound in general.IntroductionOptics has had a very long and full history, from ancient Greece,… …   Wikipedia

• Speed of light — The speed of light in the vacuum of free space is an important physical constant usually denoted by the letter c . [NIST and BIPM practice is to use c 0 for the speed of light in vacuum in accord with international standard ISO 31 5. See… …   Wikipedia

• celestial mechanics — the branch of astronomy that deals with the application of the laws of dynamics and Newton s law of gravitation to the motions of heavenly bodies. [1815 25] * * * Branch of astronomy that deals with the mathematical theory of the motions of… …   Universalium

• Sniper equipment — The major components of sniper equipment are the sniper rifle, ammunition and camouflage. In modern U.S. Army parlance, the sniper rifle, optics, cleaning kits, cases, and other accessories are considered a Sniper Weapon System and are issued as… …   Wikipedia

• Impact crater — The prominent impact crater Tycho on the Moon. In the broadest sense, the term impact crater can be applied to any depression, natural or manmade, resulting from the high velocity impact of a projectile with a larger body. In most common usage,… …   Wikipedia

• Whisper Family of Firearm Cartridges — The Whisper Family of firearm cartridges are a group of wildcat cartridges developed in the early 1990s by J.D. Jones of SSK Industries. The Whisper Family was developed as a line of extremely accurate, multi purpose cartridges using relatively… …   Wikipedia