Question

Energy required for the electron excitation in `Li^(++)` from the first to the third Bohr orbit is:
A. `12.1 eV`
B. `36.3 eV`
C. `108. 8 eV`
D. `122.4 eV`

Answer 1

Correct Answer - C
`E_(1)=(13.6(3)^(2))/((1)^(2))`
`E_(3)=(13.6(3)^(2))/((3)^(2))`
`:. DeltaE-E_(3)-E_(1)`
`=13.6(3)^(2)[1-(1)/(9)]`
`=(13.6xx9xx8)/(9)`
`DeltaE=108.8 eV`