The radius of the second Bohr orbit for hydrogen atom is : (Plank'c const. `h = 6.6262 xx 10^(-34) Js` , mass electron ` = 9.1091 xx 10^(-31)` Kg , charge of electron ` e = 1.60210 xx 10^(-19)` , permittivity of vaccum ` in_(0) = 8.854185 xx 10^(-12) kg^(-1) m^(-3) A^(2))`

Options

A. `1.65 Å`
B. `4.76 Å`
C. `0.529 Å`
D. `2.12 Å`

Answer

D

Explanation

`r= (in_(0)n^(2)h^(2))/(pi m e^(2)z), 1 Å= 10^(-10)m`