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An electron is moving in 3^(rd) orbit of...

An electron is moving in `3^(rd)` orbit of `Li^(+2)` and its separation energy is y.The separation energy of an electron moving in `2^(nd)` orbit of `He^(+)` is

A

`(4y)/( 9)`

B

`(y)/(9)`

C

`-(y)/(9)`

D

y

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