How much time does it take a pulse of light to travel through 120 m of water?
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2 answers

time=distance/speedlight
now the speed of light in water is slowed..
speedinwater=speedlightfreespace/(4/3)
look up the speed of light in free space, and memorize it. 👍
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a^2 + b^4 = gtrdrvf
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answered by Daddy
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