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The radius of the second Bohr orbit,...

The radius of the second Bohr orbit, in terms of the Bohar radius `a_(0)` in `Li^(2+)` is :

A

`(4a_(0))/(9)`

B

`(4a_(0))/(3)`

C

`(2a_(0))/(3)`

D

`(2a_(0))/(9)`

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