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	Physics How many nanoseconds does it take light to travel a distance of 6.60 km in vacuum?
	2 Answers Asked By Tiffany

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	This question is primary testing your ability to convert numbers into different units. Light travels at 3.0 x 10^8 m / 1 s. Since 1 s = 10^9 nanoseconds and 1 m = 10^-3 km), we can make this substitution to get the speed of light in km / nanoseconds: v = [3.0 x 10^8 m/s * (10^-3 km/m)] / [1 s * (10^9 nanoseconds/s)] = 3.0 x 10^-4 km/nanosecond Now we just plug in our numbers and solve: d = vt 6.6 km = (3.0 x 10^-4 km/nanosecond)(t) t = 22,000 nanoseconds Answered By Aprenda, Inc.

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