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 = (d)/(c)`

`t = (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`