Question

A planet of mass m moves around the sun of mass M in an elliptical orbit. The maximum and minimum distance of the planet from the sun are $r_{1}\ and\ r_{2}$ respectively. The time period of planet is proportional to(a) $r^{\frac{2}{5}}_{1}$(b) $(r_{1}+r_{2})^{\frac{3}{2}}$(c) $(r_{1}-r_{2})^{\frac{3}{2}}$(d) $r^{\frac{3}{2}}$

Answer 1

the option in c..........