The total energy of an electron in the first excited state of the H-atom is about - 3.4 eV. Which of the answers above would change, if the choice of the zero of potential energy is changed?
The potential energy of a system depends on the reference point taken. Here, the potential energy of the reference point is taken as zero. If the reference point is changed, then the value of the potential energy of the system also changes. Since, total energy is the sum of kinetic and potential energies, total energy of the system will also change.