Question
For any given series of spectral lines of atomic
hydrogen, let $\Delta \mathop v\limits^\_ = $ $\Delta {\overline v _{\max }} - \Delta {\overline v _{\min }}$ be the difference
in maximum and minimum frequencies in
cm–1. The ratio Lyman Balmer ${{\Delta {{\overline v }_{Lyman}}} \over {\Delta {{\overline v }_{Balmer}}}}$ is :