Which of these unit is lasrgest: AU, light year and parsec. Express the average distance of earth from the sun in (i) light year (ii) per sec.

Explanation

parsec is largest unit.
parsec > light yeat > AU
Average distance of earth from the sun is (d) (astronomial unit).
(i) `d=1AU=1.496xx10^(11)m`
`=(1.496xx10^(11))/(9.46xx10^(15))=1.58xx10^(-5)` light year.
(ii) `d=(1.496xx10^(11))/(3.08xx10^(-6))` par sec
`=4.86xx10^(-6)` par sec