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The difference between the radii of 3^(r...

The difference between the radii of `3^(rd)` and `4^(th)` orbits of `Li^(2+)` is `Delta R_(1)` . The difference between the radii of `3^rd` and `4^(th)` orbits of `He^(+)` is `DeltaR_(2)` . Ratio `DeltaR_(1) : Delta R_(2)` is :

A

`8 : 3`

B

`3 : 8`

C

`2 : 3`

D

`3 : 2`

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