1.

The two planets have radius r_(1) and r_(2), densities d_(1) and d_(2). The ratio of acceleration due to gravity on them is :

Answer»

`r_(1)d_(2): r_(2)d_(1)`
`r_(1)^(2)d_(1):r_(2)^(2)d_(2)`
`r_(1)d_(1)^(2):r_(2)d_(2)^(2)`
`r_(1)d_(1):r_(2)d_(2)`.

Solution :`G=(GM)/(R^(2))=(G)/(R^(2))*(4)/(3)PI R^(3) d rArr g=(4)/(3) pi Rd G`
`therefore (g_(1))/(g_(2))=(R_(1)d_(1))/(R_(2)d_(2))`
THUS correct choice is (d).


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