Correct Answer - C
`(g_(m))/(g_(e)) = (G(M//8))/(GM//R_(e)^(2)) = (R_(e)^(2))/(8R_(m)^(2))` ….(i)
दिया है, `(mg_(m))/(ng_(e)) = (1)/(6)`
`implies (g_(m))/(g_(e)) = (1)/(6)` ….(ii)
समी (i ) व (ii ) से,
`(R_(e)^(2))/(8R_(m)^(2)) = (1)/(6) implies R_(e) =sqrt((8)/(6)) R_(m)`