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 ?
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:

We know that the distance is given by the expression –

Distance = Speed x Time

Given, speed of light = 1 unit

And time taken = * min 20 seconds

=8 x 60 + 20 = 480 + 20

Time = 500s

Therefore, Distance = 1 x 500 = 500 units.