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R and r are the radii of the earth and moon respectively. pe  and  pm are the densities of earth and moon respectively. The ratio of the accelerations due to gravity on the surfaces of earth and moon is

(a)      R/r  pe/ pm                 (b)  r/R  pe/ pm

(c)      r/R  pe/ pm                   (d) R/r  pe/ pm

Answer: a

(6)

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