Extremadura PAU Physics Practice Questions - Extremadura PAU Physics (Física) Exam

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Planet A orbits a star at a mean orbital radius rA, with an orbital period of TA = 8.0 years. Planet B orbits the same star at a mean orbital radius rB = 4 * rA. According to Kepler's Third Law (T^2 / r^3 = constant), what is the orbital period of Planet B?

32 years 64 years 16 years 128 years

Correct Answer:

64 years

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