Electron present in single electron specie jump from energy level 3 to 1 .Emitted photons when passed
through a containig excited He^(+) ino cause further excition to same higher energy level (Given
`E_(n)=-13.6(Z^(2)/(n^(2)))`.Determine
(i) Atomic number of single electron specie.
(ii) principle quantum number of inital excited level & higher energy level of `He^(+)`.

Answer

Energy of emitted photons can not be greater than `13.6eV`(otherwise `He^(+)` will ionise ) therefore
singlr electron specie must br hydrogen
energy emitted = `E_(3)-E_(1)`
` =-1.51 + 13.6 =12.09`
For `He^(+)` ion this energy correspond to excitation from 2 to 6.