A hydrogen like atom in ground state absorbs `n` photon having the same energy and its emits exacity `n`` photon when electrons transition takes placed .Then the energy of the absorbed photon may be

Options

A. `91.8 eV`
B. `40.8 eV`
C. `48.4 eV`
D. None of these

Answer

A, B

Explanation

No. of drank lines (in absorption) i.e. ecitation `=` No. of bright lines (in emission) i.e. de-excitation [is possible only when the `e^(-) s` is excited to `n = 2` from ground state]
Cleraly, `DeltaE = underset((Li^(2+)))(91.8 eV)` and `underset((He^(+)))(40.8eV)` are possible