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单词 speed of light
释义
speed of light

Physics
  • Symbol c. The speed at which electromagnetic radiation travels. The speed of light in a vacuum is 2.997 924 58×108 m s−1. When light passes through any material medium its speed is reduced (see refractive index). The speed of light in a vacuum is the highest speed attainable in the universe (see relativity; Cherenkov radiation). It is thought to be a universal constant and is independent of the speed of the observer. Since October 1983 it has formed the basis of the definition of the metre.


Mathematics
  • In a vacuum, light travels at 299,792,458 ms−1. This is the same for other electromagnetic waves.


Space Exploration
  • The speed at which light and other electromagnetic waves travel in a vacuum. Its value is 299 792 458 m per second, but for most calculations 3 × 108 m s−1 (300 million metres per second) suffices. In glass, the speed of light is two-thirds of its speed in air, about 200 million metres per second. The speed of light is the highest speed possible, according to the theory of relativity, and its value is independent of the motion of its source and of the observer. It is impossible to accelerate any material body to this speed because it would require an infinite amount of energy.


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