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Posted by on Monday, September 5, 2011 at 3:19pm.

he speed of light in a vacuum is about 3.00 108 m/s how many kilometers a pulse from a laser beam travels in exactly 3.9 hours.

  • physics - , Monday, September 5, 2011 at 3:27pm

    change 3.9hrs to seconds,multipy by the speed of light.

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