4. Let the period of revolution of a planet at a distance R from a star be T. Provethat if it was at a distance of 2R fromthe star, its period of revolution will be8T.

4. Let the period of revolution of a planet at a distance R from a s

1.	4. Let the period of revolution of a planet at a distance R from a star be T. Provethat if it was at a distance of 2R fromthe star, its period of revolution will be8T.
Answer» i. ACCORDING to Kepler's third law, The square of orbital period of revolution T of a planet AROUND a star is directly proportional to the CUBE of the mean distance R of the planet from the star. THUS, for a planet, at a distance of 2R from the star, its period of revolution will be √8 T.

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4. Let the period of revolution of a planet at a distance R from a star be T. Provethat if it was at a distance of 2R fromthe star, its period of revolution will be8T.​

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4. Let the period of revolution of a planet at a distance R from a star be T. Provethat if it was at a distance of 2R fromthe star, its period of revolution will be8T.