The radii of two planets $A$ and $B$ are $R$ and $4R$ and their densities are $\rho$ and $\frac{\rho}{3}$ respectively. The ratio of acceleration due to gravity at their surfaces $g_A : g_B$ will be (1) $4:3$ (2) $1:16$ (3) $3:16$ (4) $3:4$
The radii of two planets $A$ and $B$ are $R$ and $4R$ and their densities are $\rho$ and $\frac{\rho}{3}$ respectively. The ratio of acceleration due to gravity at their surfaces $g_A : g_B$ will be\\
(1) $4:3$\\
(2) $1:16$\\
(3) $3:16$\\
(4) $3:4$