Two Planets Each Travel in a Circular Orbit About a Star

question 46

Multiple Choice

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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