Two planets each travel in a circular orbit about a star at radii of r_a = 2R and r_b = R,respectively.What is the ratio of their periods T_a/T_b? A) 1.6 B) 2.8 C) 1.3 D) 1.4 E) 2.0

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The Answer of Two planets each travel in a circular orbit about a star at radii of r_a = 2R and r_b = R,respectively.What is the ratio of their periods T_a/T_b? A) 1.6 B) 2.8 C) 1.3 D) 1.4 E) 2.0

Two Planets Each Travel in a Circular Orbit About a Star