Question

Suppose a light planet is revolving in circular orbit of radius R about a heavy star and its time period is T. Gravitational force between the planet and the star is directly proportional to R^-5/2, then:

(a) T² ∝ R³

(b) T² ∝ R^7/2

(c) T² ∝ R^3/2

(d) T² ∝ r^3.75
 

Answer 1

Correct option is (b) T² ∝ R^7/2