Question

How long does it take light to travel 850 km in a vacuum? Answer in ms.(Express your answer to two significant figures.)

Answer 1

0.002833 sec

Step-by-step explanation:

Speed of light in vacuum is
`3* 10^(8)m/sec`

Given distance = 850 km = 850×1000=850000 m

We have to calculate the time that light take to travel the distance 850 km

Time
`T=(distance )/(speed)=(850000)/(3* 10^8)=2.833* 10^(-3)sec`

So the time taken by light to travel 850 km is 0.002833 sec