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 sec. to cover the distance ?

Options

A. 300
B. 400
C. 500
D. 600

Answer

C

Explanation

Here,
Speed of light in vaccum `c=1` nw unit of length `s^(-1)` time taken by light of sun to reach the earth
`t=8` min and 20 seconds `=(8xx60+20)s=500s`
`therefore` Distance between the sun and the earth
`S=ct=1` new unit of length `s^(-1)xx500s`
`=500` new unit of length.