1.

It takes 5 years for light to reach the earth from a star. Express the distance of the star from the earth in i) light year ii) km. Take speed of light = 3 * 10^8 m/s and 1 year = 3.153 * 10^7 s.

Answer»

ere!i) The distance TRAVELLED by the light in 1 year is called 1 light year.Thus the distance travelled by light in 5 years = 5 light years.ii) 1 light year = Speed of light * TIME in 1 year                       = (3 * 10^8) * (3.153 * 10^7) = 9.46 * 10^15 m = 9.46 * 10^12 kmDistance of a STAR from the EARTH = 5 * 9.46 * 10^12 km = 4.73 * 10^13 kmHope It HELPS You!



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