Chemistry - Atomic Structure Question with Solution | TestHub

$E=13.6\times 9\times (1/n_1^2-1/n_2^2)=122.4\times (1/n_1^2-1/n_2^2)$ eV, with $n_1$ the lower and $n_2$ the upper level. 4 to 1: 114.8 eV. 3 to 1: 108.8 eV. 2 to 1: 91.8 eV. 4 to 2: 22.95 eV. 3 to 2: 17.0 eV. 4 to 3: 5.95 eV.

Greater than 40 eV: only the three lines that end at $n=1$.

Answer: 3.