question_answer 5)

A new unit of length is chosen such that the speed of light in vacuum is unity. What is the distance between the sun and the earth in terms of the new unit if light takes 8 min and 20 s to cover this distance ? 

Answer:

Speed of light = 1 new unit of length / s Time = 8 min Distance between the earth and the sun = Speed of light x time = 500 new units of length.