2007-05-20 18:42:34 · 16 answers · asked by rjforcione@sbcglobal.net 1 in Science & Mathematics ➔ Astronomy & Space
the speed of light traveling through a vacuum, in metric units, it's exactly 299,792,458 meters per second
Approximatley 186,000 miles per second, which is about one foot per nanosecond.
2007-05-20 18:53:39 · answer #1 · answered by Anonymous · 0⤊ 0⤋
The speed of light in a vacuum is an important physical constant denoted by the letter c for constant or the Latin word celeritas meaning "swiftness". It is the speed of all electromagnetic radiation in a vacuum, not just visible light.
In metric units, c is exactly 299,792,458 meters 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 meter, has been defined since October 21, 1983 in terms of the speed of light; one meter is the distance light travels in a vacuum in 1/299,792,458 of a second. Thus, any further increase in the precision of the measurement of the speed of light will actually change the length of the meter; the speed of light will remain precisely 299,792,458 m/s. In imperial units, the speed of light is about 186,000 miles per second, that is about one foot per nanosecond.
2007-05-21 01:50:03 · answer #2 · answered by Anonymous · 0⤊ 0⤋
The absolute distance the light travels during a period of time divided by that time.
Generally about 300 thousand km/sec, but it depends on where the light is traveling. If it travels near a black hole, speeds may vary.
2007-05-21 01:58:57 · answer #3 · answered by Anonymous · 0⤊ 0⤋
3*10^8 m/s
2007-05-21 01:45:34 · answer #4 · answered by electric 3 · 0⤊ 0⤋
Hi. A proven value approximately equal to 299,000 k/s. http://www.answers.com/main/ntquery?s=speed+of+light&gwp=13
2007-05-21 01:45:49 · answer #5 · answered by Cirric 7 · 0⤊ 0⤋
3*10^8 Meters/sec
2007-05-21 01:46:50 · answer #6 · answered by JAMES 4 · 0⤊ 1⤋
A supposed constant at approximately 186,000 miles per second, per second in a vacuum.
2007-05-21 01:54:55 · answer #7 · answered by Anonymous · 0⤊ 0⤋
its about 300,000km/h or 186,000mph
this value is not accurate however..
this is because it was discovered by calculating the time it takes for a light from a star to reach earth.. it is not proven yet..
but one thing for sure, its damn fast..
2007-05-21 03:32:56 · answer #8 · answered by kish 2 · 0⤊ 0⤋
3 *10^8m\s ,12000 Lunar Orbits/Earth Day
2007-05-21 01:54:54 · answer #9 · answered by Anonymous · 0⤊ 0⤋
It is 300.000 kilometers per second, as calculated By Isaac Newton and corroborated by several scientists after him..
2007-05-21 01:45:36 · answer #10 · answered by Sehr_Klug 50 6 · 0⤊ 0⤋