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Two planets move around the Sun. The per...

Two planets move around the Sun. The periodic times and the mean radii of the orbits are `T_1,T_2` and `r_1,r_2` respectively. The ratio `T_1//T_2` is equal to

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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