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Acceleration due to gravity on moon is 1/6 of the acceleration due to gravity on earth.  If the ratio of densities of earth  ( pe ) and moon ( pm )  is ( pe/pm )  = 5/3  then radius of moon Rm in terms of Re will be

(a)      5/18 Re                            (b)  1/6 Re

(c)   3/18 Re                          (d) 1/2√3 Re

Answer: a

(15)

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