According to Kepler's law of planetary motion, if T represents time period and r is orbital radius, then for two planets these are related as [Manipal 2015]

• A

  ${\left(\frac{T_1}{T_2}\right)}^{3/2}=\frac{r_1}{r_2}$

• B

  $\frac{T_1}{T_2}=\left[\frac{r_1}{r_2}\right]$

• C

  ${\left[\frac{T_1}{T_2}\right]}^2={\left[\frac{r_1}{r_2}\right]}^3$

• D

  $\frac{T_1^2}{T_2}=\frac{r_1^3}{r_1}$