Question

Give approximate ratio of 1 AU and 1 light year.

Answer 1

1 AU(Austronomical unit) =1.5*10^11 m
1 LY(Light year) =9.46*10^15 m

ratio of them
=1AU/1LY = 1.5*10^11/9.46*10^15
=(1.5/9.46) *10^-4
= 0.159 * 10^-4
= 1.59*10^-4