whatt is the speed of light?

In a vacuum it is 299,792,458 m/s (metres per second)

According to this website when people refer to the sped of light they refer to its speed in a vacuum.

The speed of light is normally rounded to 300 000 kilometers per second or 186 000 miles per second.

The speed of light depends on the material that the light moves through - for example: light moves slower in water, glass and through the atmosphere than in a vacuum. The difference of the speed of light in other things is generally ignored.

2006-10-29 01:37:36 · answer #1 · answered by green_kiwi18 2 · 0⤊ 0⤋

In metric units, c is exactly 299,792,458 metres per second (1,079,252,848.8 km/h). Note that this speed is a definition, not a measurement, since the fundamental SI unit of length, the metre, has been defined since October 21, 1983 in terms of the speed of light: one metre is the distance light travels in a vacuum in 1/299,792,458 of a second. Converted to imperial units, the speed of light is approximately 186,282.397 miles per second, or 670,616,629.384 miles per hour, or almost one foot per nanosecond.

Through any transparent or translucent material medium, like glass or air, it has a lower speed than in a vacuum; the ratio of c to this slower speed is called the refractive index of the medium(the actual speed is not affected, the speed of light is constant, the fact that the light is reflected around inside the glass will make a greater amount of time necessary for it to reach the next point). In an analogous way, the light speed is also affected by changes in gravity. This gives rise to the phenomenon of gravitational lensing, in which large assemblies of matter can refract light from far away sources, so as to produce multiple images and similar optical distortions

2006-10-29 08:42:54 · answer #2 · answered by miamac49616 4 · 0⤊ 0⤋

speed of light is : 3 X 10^8

2006-10-29 08:34:52 · answer #3 · answered by mystery_everywhere007 1 · 0⤊ 1⤋

The speed of light is the speed at which electromagnetic waves can move in a vacuum: 299,792,458 meters/sec (186,000 miles/second). According to Einstein's Theory of Relativity, nothing can go faster than the speed of light. SPEED OF SOUND The speed of sound is the speed at which sound moves through air. At sea level and standard atmospheric pressure, the speed of sound is 1116.45 feet per second (340.294 meters per second).

2006-10-29 08:44:18 · answer #4 · answered by Anonymous · 0⤊ 0⤋

3 x 10^8 m/s

2006-10-29 08:35:16 · answer #5 · answered by ssshhh 3 · 0⤊ 0⤋

The speed of light is how fast a Photon travels. A photon is the smallest unit or bundle of light. It travels at 186,282.397 miles per second, or 670,616,629.384 miles per hour, or almost one foot per nanosecond. According to Einstein nothing can travel faster than this speed.

2006-10-29 08:43:45 · answer #6 · answered by Buddy 1 · 0⤊ 0⤋

3 x 10 to the power 8.

2006-10-29 08:35:54 · answer #7 · answered by Anonymous · 0⤊ 1⤋

speed of light is 3*100000000meters/second.(10 to the power of 8)
mind you light is not the fastest thing in the universe!!!

2006-10-29 08:45:08 · answer #8 · answered by shreya i 2 · 0⤊ 0⤋

hi no,
The exact speed of light with 0.000001% accuracy according to latest precision experiments conducted using the Hubble telescope by Nasa scientists is 299,792,458 m/s in vacuum.But for all practical scientific calculations it is assumed to be 300000000 m/s.The speed of light is the only non relative entity in this universe according to Einstein.Nothing can overtake it.Some scientists even consider it as their God.

2006-10-29 09:10:38 · answer #9 · answered by JACKREX 2 · 0⤊ 0⤋

The speed of light is 186,282,397 miles per second. No kidding.

2006-10-29 08:38:35 · answer #10 · answered by ElOsoBravo 6 · 0⤊ 1⤋

whatt is the speed of light?

17 answers