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  4. The radii of two planets are respectively R1 & R2 and their densities are respectively ρ 1 & ρ 2 . The ratio of the acceleration due to gravity at their surface is -

Q. The radii of two planets are respectively & and their densities are respectively & . The ratio of the acceleration due to gravity at their surface is -

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Solution:

The value of at surface


So,

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