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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