In a hypothetical Bohr hydrogen atom,the mass of the electron is doubled. The energy $E_0$ and the radius $r_0$ of the first orbit will be ($a_0$ is the Bohr radius).
- A$E_0 = -27.2 \text{ eV}; r_0 = a_0/2$
- B$E_0 = -27.2 \text{ eV}; r_0 = a_0$
- C$E_0 = -13.6 \text{ eV}; r_0 = a_0/2$
- D$E_0 = -13.6 \text{ eV}; r_0 = a_0$
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