A light planet is revolving around a massive star in a circular orbit of radius \( R \) with a period of revolution \( T \). If the force of attraction between planet and star is proportional to \( R^{-3/2} \) then chose the correct option:
\( T^2 \propto R^{7/2} \)
\( T^2 \propto R^{5/2} \)
\( T^2 \propto R^{3} \)
\( T^2 \propto R^{3/2} \)
