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Two planets are revolving round sun in t...

Two planets are revolving round sun in the time periods `T_1`and `T_2` in the circular path of radius `r_1` and `r_2`. Then `T_1//T_2` will be —

A

`(r_1/r_2)^(1//2)`

B

`r_1/r_2`

C

`(r_1/r_2)^2`

D

`(r_1/r_2)^(3//2)`

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