A hunter uses a laser range finder to find out the distance to his target. If it takes #5.4*10^-7# seconds for the light beam to return to the rangefinder after the hunter turns it on, how far away is the deer?

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Answer 1 · 2016-04-26T20:17:31

#81m#

The velocity of light in air is about #3xx10^8 "m/s"#

Hence by this time the distance travelled by light is: #162m#

So the distance is: #162/2 m = 81m#