2007-12-30 04:05:31 · 13 answers · asked by just4 fun 1 in Science & Mathematics ➔ Physics
For any material, the speed of light is 1/ (e u)^1/2
where e - is the electrical permittivity of the material, and
u - is the magnetic permeability of the material#
In a vacuum this is 2.9979246 x 10^8 meters/second.
The speed of light will change if the electrical properties of the medium it is in changes.
2007-12-30 04:18:35 · answer #1 · answered by WhatWasThatNameAgain? 5 · 0⤊ 0⤋
1
2007-12-30 12:14:41 · answer #2 · answered by Anonymous · 0⤊ 0⤋
The most appropriate speed of the light is 299 792 458 m/s.
2007-12-30 12:52:29 · answer #3 · answered by ? 2 · 0⤊ 0⤋
the speed of light is 3*10^8 m/s or 2.98*10^8 m/s and it is the universal speed limit and according to Albert Einstein's special theory of relativity nothing can pass the speed of light.
2007-12-30 21:27:16 · answer #4 · answered by Einstein Freak 2 · 0⤊ 0⤋
The speed of light in a vacuum is exactly 299,792,458 m/s. In fact the speed of light is known so precisely, that the length of one meter has been re-defined as the distance light travels in 1/299,792,458 of a second.
2007-12-30 12:14:11 · answer #5 · answered by Charles M 6 · 1⤊ 0⤋
Light travels at approximately 186,000 miles per second. Thus, the sun being about 93,000,000 miles away, it takes sunlight about 8.33 minutes to reach earth. The moon being only about 293,000 miles away, light reflected off the moon reaches earth in about 1.5 seconds
2007-12-30 12:57:51 · answer #6 · answered by Swamp Fox 1 · 0⤊ 0⤋
The speed of light in a vacuum is exactly 299,792,458 m/s (about 186,282.397 miles per second).
2007-12-30 12:07:30 · answer #7 · answered by ChatNoir 4 · 2⤊ 0⤋
For ease of arithmetic, it is usually assumed to be:
3 * 10^8 m/s.
The exact speed (in a vacuum) is:
299,792.458 m/s.
2007-12-30 13:50:24 · answer #8 · answered by Anonymous · 0⤊ 0⤋
3*10^8 m/s
2007-12-30 12:07:40 · answer #9 · answered by Anonymous · 0⤊ 2⤋
Hi. It varies with the medium it is traveling through. Your first answers are correct for a vacuum.
2007-12-30 12:09:58 · answer #10 · answered by Cirric 7 · 0⤊ 1⤋