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# What is the speed of light in miles per second?

Question #790. Asked by buster333. (Apr 07 00 12:00 AM)

essaychess

186,000 miles per second

 Apr 07 00, 2:11 AM
hummerh3

186,282.397 miles per second. There are 5,878,639,427,505.244 miles in one light year and 19,173,514,177,205.12 miles in one parsec.

 Feb 28 04, 9:59 AM
sequoianoir

Depends upon whether the light is travelling in a vacuum, air, water, glass or some other medium.

 Feb 28 04, 1:03 PM
hummerh3

186,282.397 miles per second in a vacuum. In water the speed of light is about 25% less, and in glass, 33% less.

 Mar 09 04, 6:30 PM

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