If the light travels at speed of 3.0×108m/s. How long will it take to cover the 100m ?

1 Answer
Feb 25, 2018

#3.33*10^-7 \ "s"=333 \ "ns"#

Explanation:

The speed of light in a vacuum is #3*10^8 \ "m/s"#.

So, to cover a distance of #100 \ "m"#, it takes them

#(100color(red)cancelcolor(black)"m")/(3*10^8color(red)cancelcolor(black)"m""/s")~~3.33*10^-7 \ "s"#

We can now convert to a more appropriate symbol, such as the nanoseconds.

#1 \ "ns"=1*10^9 \ "s"#

#:.3.33*10^-7 \ "s"=3.33*10^-7*10^9 \ "ns"#

#=3.33*10^2 \ "ns"#

#=333 \ "ns"#

So, it will take light approximately #333# nanoseconds to travel #100 \ "m"#.