Question

The energy levels of a hypothetical one electron atom are shown in the figure above. The initial kinetic energy of an electron is $11eV$ and it interacts with the above said hypothetical one electron atom, the minimum energy carried by the electron after interaction is :

• A. $0.7eV$
• B. $0.3eV$
• C. $0.9eV$
• D. $1eV$

Answer 1

The correct option is A $0.7eV$

Energy needed to excite the electron from n=1 to n=2 is $15.6-5.3=10.3eV$
And, electron has $11eV$.
Therefore, atom takes $10.3eV$ leaving the electron with $0.7eV$