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The ratio of radius of 2nd and 3rd Bohr ...

The ratio of radius of 2nd and 3rd Bohr orbit is

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The radius of `nth` orbit `(r_n)` of hydrogen atom is given as :
`r_n = (n^2h^2)/(4 pi^2 m e^2)`
`r_n prop n^2`
Radius of second orbit `r_2 prop 2^2 "or" 4`
Radius of third orbit, `r_3 prop 3^2 "or" 9`
`:. (r_2)/(r_1) = 4/9`
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