Question

How many nanoseconds does it take light to travel a distance of 3.20 km in vacuum?

Answer 1

Distance covered by the light = 3.20 km = 3200 meter

speed of the light is $c = 3* 10^8 m/s$

so here time to cover the given distance

$t = \frac{d}{c}$

$t = \frac{3200}{3*10^8}$

$t = 1.067 * 10^{-5}s$

as we know that

$1 ns = 10^{-9} s$

So the time tocover the distance in nanosecond unit is

$t = 10670 ns$