light speed
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light speed — noun the speed at which light travels in a vacuum; the constancy and universality of the speed of light is recognized by defining it to be exactly 299,792,458 meters per second • Syn: ↑speed of light, ↑c • Hypernyms: ↑speed, ↑velocity, ↑constant … Useful english dictionary
Speed cameras in Australia — Speed Cameras are used in Australia to enforce speed limits. Mobile CamerasGatso Speed CameraThis mobile camera is used in Victoria and Queensland, and can be operated in various manners. Without a flash, the only evidence of speed camera on the… … Wikipedia
red-light speed camera — noun a camera at a road intersection, combining the functions of a red light camera and a speed camera …
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
light — light1 lightful, adj. lightfully, adv. /luyt/, n., adj., lighter, lightest, v., lighted or lit, lighting. n. 1. something that makes things visible or affords illumination: All colors depend on light. 2. Physics … 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
speed — speed1 W1S2 [spi:d] n ▬▬▬▬▬▬▬ 1¦(of movement)¦ 2¦(of action)¦ 3¦(fast)¦ 4¦(photography)¦ 5¦(drug)¦ 6 five speed/ten speed etc 7 up to speed ▬▬▬▬▬▬▬ [: Old English; Origin: sped success, quickness ] … Dictionary of contemporary English
speed of light — noun the speed at which light travels in a vacuum; the constancy and universality of the speed of light is recognized by defining it to be exactly 299,792,458 meters per second (Freq. 1) • Syn: ↑light speed, ↑c • Hypernyms: ↑speed, ↑velocity,… … Useful english dictionary
speed of light — noun The speed of electromagnetic radiation in a perfect vacuum: exactly 299,792,458 metres per second. Syn: Einstein barrier, Einstein constant, lightspeed, light speed, c See Also: subluminal … Wiktionary
Light cone — in 2D space plus a time dimension. A light cone is the path that a flash of light, emanating from a single event (localized to a single point in space and a single moment in time) and traveling in all directions, would take through spacetime. If… … Wikipedia
