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The radius of the first Bohr orbit of hy...

The radius of the first Bohr orbit of hydrogen is `0.529A^(@)`. The radius of the `3^(rd)` orbit of `He^(+)` will be

A

`8.46A^(@)`

B

`0.705A^(@)`

C

`1.59A^(@)`

D

`2.38A^(@)`

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