Question

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for two planets revolving about the sun, the of the ratio of the periods equals the of the ratio of the orbital radii.
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Explanation:

This question relates to Kepler's Third Law of Planetary Motion, which states that the square of the orbital period of a planet is proportional to the cube of the semi-major axis of its orbit. For two planets, this translates to the square of the ratio of their periods being equal to the cube of the ratio of their orbital radii.

Answer:

square, cube