question_answer

The total energy of an electron in the first excited state of hydrogen atom is about \[-\,3.4\,eV\] What is the potential energy of the electron in this state.

Answer:

\[-\,6.8\,eV\] Total energy, \[E=-\,3.4eV\] Since, potential energy \[=2\times \] total energy \[=2\times (-\,3.4)=-\,6.8\,\text{eV}\]