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A double star is a system of two stars of masses `m` and `2m`, rotating about their centre of mass only under their mutual gravitational attraction. If `r` is the separation between these two stars then their time period of rotation about their centre of mass will be proportional to

A

`l^(3//2)`

B

`l`

C

`m^(1//2)`

D

`m^(-1//2)`

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The correct Answer is:
A, D
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