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

Average distance of earth from the sun = 1AU
`=1.496xx10^(11)m`
(i) 1 light year `=9.461xx10^(15)m`
`R= (1.496xx10^(11))/(9.461xx10^(15))ly=0.158xx10^(-4)ly`
`=1.58xx10^(-5)ly`
(ii) 1 parsec `=3.08xx10^(16)m`
`R=(1.496xx10^(11))/(3.08xx10^(16))" parsec "=0.486xx10^(-5)` parsec
`=4.86xx10^(-6)` parsec.