Question

Let the period of revolution of a plant
at a distance R from a star be T
prove that it it was at distance 2R
its period of revolution will be to✓8T​

Answer 1

Answer:

according to law of gravitation we know that square of timeperiod is proportional to cube of radius.

hence proved.

hope it helps

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Answer 2

I think its helpfull

another answer,

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.