Question

According to one of the Kepler's laws of planetary motion :
(a) $r^2\propto T^3$
(b) $r\propto T^2$
(c) $r^3\propto T^2$
(d) $r^3\propto \frac{1}{T^2}$

Answer 1

Kepler’s third law: The cube of the mean distance of a planet from the sun is directly proportional to the square of time it takes to move around the sun.
so option c is correct