In a hypothetical Bohr hydrogen, the mass of the electron is doubled. The energy Eo and the radius ro of the firstorbit will be (ao is the Bohr radius)

Here radius of electron orbit r ∝ 1/m and energy E∝m, where m is the mass of the electron.Hence energy of hypothetical atomEo=2×−13.6eV=−27.2eV  and  radius  ro=ao2