Two Planets Travel in Circular Orbits About a Star

question 75

Multiple Choice

Two planets travel in circular orbits about a star.The period of planet A is T,while that of planet B is 3T.What is the ratio of the orbital radii,R_A/R_B?

• A) 0.33
• B) 0.19
• C) 0.48
• D) 0.69

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