Question

The speed of light is 2.998*10^8 m/s. how long does it take light to travel 40 cm ?

Answer 1

The speed of light is:
`c=2.998 \cdot 10^8 m/s`

The distance that should be covered by the light is:
`S=40 cm=0.4 m`

Therefore, we can calculate the time the light takes to cover this distance by using the basic relationship between space, time and distance:

`t=(S)/(c)=(0.4 m)/(2.998\cdot 10^8 m/s)=1.334\cdot 10^(-9) s`

which corresponds to 1.334 nanoseconds.