The masses of two planets are in the ratio `1 : 2`. Their radii are in the ratio `1 : 2`. The acceleration due to gravity on the planets are in the ratio

Options

A. `1:2`
B. `2:1`
C. `3:5`
D. `5:3`

Answer

b

Explanation

`(g_(2))/(g_(1))=(M_(2))/(M_(1))xx((R_(1))/(R_(2)))^(2)=(1)/(2)xx(4)/(1)=(2)/(1)`