Two planets A and B have radius in the ratio 1 : 6. A satellite revolving near the surface of planets have same time period of revolution. The ratio of density of planets A and B is :

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Time period of revolving satellite T = 2 π GM R 3 ​ ​ for satellite revolving close to earth R e ​ = R T = 2 π G 3 4 ​ π R e 3 ​ ρ R e 3 ​ ​ ​ So, T α ρ ​ 1 ​ as T is equal, ρ is also equal

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