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In a vaccuum, light travels 2.99792458 x 10^8 meters per second. How many seconds does it take light to travel across our classroom (about 8 m)?

 Sep 14, 2015
 #1
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(2.99792458 x 10^8), it takes light 1/(2.99792456 X 10^8) of a second to cover 1 meter.

Therefore it takes (2.99792458 X 10^8)/8=1/37,474,057.25 of one second to travel the distance of 8 meters. Or, written in scientific notation=2.6685 X 10^-8 seconds

 Sep 15, 2015
 #2
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2.99792584 x 10^8  m/s

8m

8m / (2.99792584 x 10^8 m/s) = 2.66851276 x 10^8 s

 Sep 15, 2015

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