In the Bohr model of an atom, the radius of a hydrogen atom in the ground state is $r_1$ and the radius of a $He^{+}$ ion in the ground state is $r_2$. Which of the following is correct?
- A$r_1/r_2 = 4$
- B$r_1/r_2 = 1/2$
- C$r_2/r_1 = 1/4$
- D$r_2/r_1 = 1/2$
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