Two Planets Travel in Circular Orbits About a Star at Radii

question 31

Multiple Choice

Two planets travel in circular orbits 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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