speed of light
31Speed — This article is about the property of moving bodies. For persons named Speed, see Speed (name). For the film, see Speed (1994 film). For other uses, see Speed (disambiguation). Classical mechanics …
32speed — 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 ] …
33Speed limit — For a discussion of the maximum speed possible in the universe, see speed of light and special relativity. A road speed limit is the maximum speed allowed by law for road vehicles. Speed limits are commonly set and enforced by the legislative… …
34Light echo — A light echo is a phenomenon observed in astronomy. Analogous to an echo of sound, a light echo is produced when a sudden flash or burst of light, such as that observed in novae, is reflected off a source and arrives at the viewer some time after …
35speed — {{Roman}}I.{{/Roman}} noun ADJECTIVE ▪ amazing, astonishing, breakneck, fast, good, great, high, incredible, lightning, phenomenal …
36light — {{Roman}}I.{{/Roman}} noun 1 brightness ADJECTIVE ▪ clear, good ▪ bright, brilliant, harsh, intense, strong ▪ blinding …
37speed — [[t]spid[/t]] n. v. sped speed•ed, speed•ing 1) rapidity in moving, traveling, performing, etc.; swiftness 2) relative rate of motion or progress: the speed of light[/ex] 3) aum a gear ratio in a motor vehicle or bicycle 4) pht a) the sensitivity …
38light 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 …
39Speed of electricity — The Speed of electricity refers to the relatively slow movement of free electrons or ions through a conductor in the presence of an electric field, also known as drift velocity. It is often confused with the propagation speed of an… …
40Light-dragging effects — In physics, there are several situations in which the motion of matter might be said to drag light .Under special relativity s simplified model it is assumed that these light dragging effects do not happen, and that the speed of light is… …
