Find ratio of radius of 2^(nd) orbit of ...

Find ratio of radius of `2^(nd)` orbit of `He^(+)` ion `& 3^(rd)` orbit of `Be^(+3)` ion.

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`r_(2)/(r_(3))=(0.529xx(2^(2))/(2))/(0.529xx(3^(2))/(4))=(8)/(9)`

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