Multiple choice

According to Kepler's third law, the orbital period T is proportional to:

  1. the orbital radius

  2. the orbital radius squared

  3. the orbital radius cubed

  4. the squre root of the orbital radius cubed
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D Correct answer
Explanation

Kepler's Third Law states that the square of the orbital period (T^2) is proportional to the cube of the semi-major axis (r^3). Therefore, T is proportional to the square root of r^3.

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