Physics

Problem

The radii of two planets 'A' and 'B' are 'R' and '4R' and their densities are

\rho

and

\rho/3

respectively. The ratio of acceleration due to gravity at their surfaces (

g_A : g_B

) will be : (1) 1 : 16 (2) 3 : 16 (3) 3 : 4 (4) 4 : 3