2007-03-03 14:50:49 · 12 answers · asked by Anonymous in Science & Mathematics ➔ Physics
300Mega-meters/sec
2007-03-03 15:11:25 · answer #1 · answered by SWH 6 · 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.
2007-03-03 23:42:02 · answer #2 · answered by paul13051956 3 · 0⤊ 0⤋
the speed of light in a vaccuum is 1/root(EoUo) approx. (3 x10^8) m/s
Eo - (epsilon not) electric permativity of space
Uo - (mu not) magnetic permativity of space
this is derived from Maxwell's modification of Ampere's law as it expreses how quickly the flux of an electric field affects the magnetic field (a relatavistic correction of an electric field). You'll have to be pretty sharp to get all this.
In actuallity the speed of light is c/N where N is the index of refraction of the material that light is being transversed over.
2007-03-03 23:12:58 · answer #3 · answered by thereytrain 2 · 0⤊ 0⤋
186, 282.397 miles per second but ONLY in an absolute vacuum. Since there's no such thing as a total, absolute vacuum, the actual speed of light is slightly slower.
2007-03-03 23:12:50 · answer #4 · answered by Chug-a-Lug 7 · 0⤊ 0⤋
The speed of light in a vacuum is exactly 299,792,458 meters per second.
2007-03-03 23:01:36 · answer #5 · answered by yehaa yahoo 2 · 0⤊ 0⤋
Hmm, I think it's 299,792,458 meters per second, but that's not impportant. The important thing is, what is the speed of dark? yeah...I bet you didn't think about that huh?....lol
2007-03-03 23:07:08 · answer #6 · answered by Anonymous · 0⤊ 0⤋
The speed of light is aprox. 300,000km per second.
2007-03-03 23:00:23 · answer #7 · answered by fatcat988 2 · 0⤊ 0⤋
299, 792, 458 m/sec OR
299, 792 KM/sec OR
186, 282.397 Miles/sec
2007-03-03 22:57:04 · answer #8 · answered by nikonf105 2 · 0⤊ 0⤋
c=2.998 x 10^8 m/s
2007-03-03 23:00:51 · answer #9 · answered by katie l 1 · 0⤊ 0⤋
3*10^8m/s
2007-03-04 00:03:52 · answer #10 · answered by shohag 1 · 0⤊ 0⤋
299,792,458 meters per second.
2007-03-03 22:56:17 · answer #11 · answered by Anonymous · 0⤊ 0⤋