A) 1 : 2
B) 2 : 3
C) 2 : 1
D) 4 : 1
Correct Answer: C
Solution :
The gravity\[g=\frac{4}{3}G\pi R\rho \] The ratio of gravities on the planet \[\frac{{{g}_{1}}}{{{g}_{2}}}=\frac{{{\rho }_{1}}{{R}_{1}}}{{{\rho }_{2}}{{R}_{2}}}\] \[\frac{{{g}_{1}}}{{{g}_{2}}}=\frac{1}{2}\times \frac{4}{1}=\frac{2}{1}\]
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