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A light planet is revolving round a mass...

A light planet is revolving round a massive star with a period of revolution T. If the gravitational force of attraction varies as `r^(-5//2)`, then `T^2` is proportional to (r is the distance between the planet and star)

A

`R^7/2`

B

`R^(-7/2)`

C

`R^5/2`

D

`R^2/5`

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