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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^3/2`

B

`r^5/2`

C

`r^7/2`

D

`r^1/2`

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