Question

it takes time 8 minutes from light to reach from the sun to the earth surface is speed of light is taken to be 3 into 10 ki power 8 1 distance from the sun to be to the earth in kilometre

Answer 1

The exact time taken by light to reach the Earth from Sun is 8 minutes and 20 seconds i.e. total 500 seconds.

Speed of light in vacuum is 3∗1083∗108 m/s.

speed=distancetimespeed=distancetime

distance=speed∗timedistance=speed∗time

distance=3∗108∗500distance=3∗108∗500

gives you 
distance=150,000,000,000distance=150,000,000,000 meters

or 150,000,000 km

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