The radius of third orbit of H-atom is r...

The radius of third orbit of H-atom is `r_3`pm and radius of fourth orbit of H-atom is `r_4`pm The ratio of `r_3` to `r_4` is

A

0.38611111111111

B

0.67291666666667

C

0.16875

D

0.12777777777778

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