by 
edndori
ANSWERS: 5
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The speed of light is 299,792,458 meters per second. Actually, that is it's speed in the vacuum of space. It IS however effected by those things.... http://math.ucr.edu/home/baez/physics/Relativity/SpeedOfLight/speed_of_light.html
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299,792,458 meters per second in a vacuum(a region with no matter in it). Light traveling through anything other than a perfect vacuum will scatter off whatever particles exist. For some materials such as water, light will slow down more than electrons will. Thus an electron in water can travel faster than light in water. The index of refraction is.....A measure of the extent to which a substance slows down light waves passing through it. The index of refraction of a substance is equal to the ratio of the velocity of light in a vacuum to its speed in that substance. Its value determines the extent to which light is refracted when entering or leaving the substance. Those materials with large indices of refraction are called optically dense media. (A medium is just a fancy word for a type of material.) Materials with indices of refraction closer to one are called optically rare media. Being naturally lazy creatures, we generally drop the word "optical'' and talk about dense and rare materials.
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I believe that the speed of light is 186,000 miles per second. It goes slower though materials though.
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is 286,000 miles per second the same as the above - close. light speed is affected by the things through which it is delivered, so, yes, it varies.
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c=299,792,458m/s
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