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Does a beam of light have a constant speed?
Light travels at a constant speed of 299,792,458 meters per second in a vacuum. However, as light travels through different mediums, it slows down depending on the medium. The crazy thing about light though, is that if it leaves a medium and starts travelling back through a vacuum, it once again goes 299,792,458 meters per second.
What is the ratio of speed of light in a vacuum to the speed of sound in air?
In a rough, round figure? 930,000 to 1. Sound travels roughly 1/5 of a mile per second in air. Light travels 186,000 miles per second in a vacuum. In five seconds sound travels one mile. In five seconds, light travels 930,000 miles in a vacuum.
Different kinds of energy waves that move at the speed of light in a vacuum make up the?
In any substance, all electromagnetic waves travel at the same speed that light travels through that substance.
What is the index of refraction for a material in which light travels with a speed that is 80 percent the speed of light in a vacuum?
It's 1/0.8 = 1.25
What travels at 300000km per second?
That is the approximate speed of electromagnetic radiation (usually referred to as light) in a vacuum.
