Difficult
$A$ 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 the planet and the star is proportional to $R^{-3/2}$,then choose the correct option:
- A$T^2 \propto R^{5/2}$
- B$T^2 \propto R^{7/2}$
- C$T^2 \propto R^{3/2}$
- D$T^2 \propto R^3$
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