Question

'The distance of a star from the earth is 8.33 light minutes.' What do you mean by this statement ? Express the distance in metre.

Answer 1

The statement ‘the distance of a star from the Earth is 8.33 light minutes’ means that the light from the star takes 8.33 minutes to reach Earth.

Speed of light $=3\times {10}^{8}m/s$

So, distance = Speed $\times$ Time

$=3\times {10}^8\times 8.33\times 60=1.5\times {10}^{11}m$