Question

what is the speed of light in vacuum​

Answer 1

Answer:

SPEED OF LIGHT IN VACUUM IS 3*10^8.

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Answer 2

Answer:

The speed of light in a vacuum is 186,282 miles per second (299,792 kilometers per second), and in theory nothing can travel faster than light. In miles per hour, light speed is, well, a lot: about 670,616,629 mph. If you could travel at the speed of light, you could go around the Earth 7.5 times in one second.