Calculate the Orbital Bohr Radius of The $n = 2$ Excited State in a Hydrogen Atom

Multiple Choice

Calculate the orbital Bohr radius of the $n = 2$ excited state in a hydrogen atom. $( r \mathrm { 1 } = 0.0529 \mathrm {~nm} )$

A) 0.212 nm
B) 0.106 nm
C) 0.170 nm
D) 0.244 nm