Question

Two planets are revolving around a star in circular orbits. If the ratio of radii of orbit is 1:4, then ratio of their time period is

Answer 1

we know, T^2 proportional to R^3.... so T1 : T2 = (R1 : R2)^(3/2)......so T1 : T2 = 1 : 8.....using Galileos laws of planetary motion