Ground state `He_2` does not exist. An electronic excited state of `He_2`

The ratio of energy of the electron in ground state of hydrogen to the electron in first excited state of Be^(3+) is

The ratio of energy of the electron in group state of the hydrogen to electron in first excited state of He^+ is.

What is the ratio of energy of the ground state of hydrogen atom and energy of the first excited state of He^+ ion (Z=2) ?

The ratio of the energy of the electron in the ground state of H to the electron in the first excited state of Be^(3+) is ,

The ratio of the energy of the electron in ground state of H to the electron in first excited state of Be^(+3) is

In a sample of H-atoms in ground state electrons make transition from ground state to a particular excited state where path length is 5 times de Broglie wavelength , electrons make back transition to the ground state producing all possible photons. If photon having 2nd highest energy of this sample can be used to excite the electron in a particular excited state of Li^(2+) ion then find the final excited state of Li^(2+) ion .

In a sample of H-atoms in ground state electrons make transition from ground state to a particular excited state where path length is 5 times de Broglie wavelength , electrons make back transition to the ground state producing all possible photons. If photon having 2nd highest energy of this sample can be used to excite the electron in a particular excited state of Li^(2+) ion then find the final excited state of Li^(2+) ion .

In a hydrogen atom , If the energy of electron in the ground state is -x eV ., then that in the 2^(nd) excited state of He^(+) is