$ a) \; \frac{r_1}{r_2} \\ b) \;\frac{r_2}{r_1} \\ c) \;constant \\ d)\; \bigg(\frac{r_1}{r_2}\bigg)^2 $

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The angular momentum of planet about sun is constant.

ie $mvr \sin \theta $= constant

where $\theta$ is the angle between radius vector and velocity vector

At P and Q $\theta=90^{\circ}$

and $m-$ mass of planet is constant.

$\therefore \; vr= constant$

$\large\frac{v_1}{v_2}=\frac{r_2}{r_1}$

Hence b is the correct answer.

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