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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