An English translation of the historic paper by Albert Einstein $"$On a Heuristic Point of View about

the Creation and Conversion of Light", originally published in Annalen der Physik, $17,132-148$

$(1905),$ is included in the Resources module of the course D$2$L site. Section $9$ of the article states

that the "largest effective wavelength" for the ionization of air by ultraviolet light is "about $1\mathrm{.}9{10}^{-5}$

$cm".$ Estimate the ionization energy of a molecule that begins to ionize at this wavelength. Give the

answer in electron$-$volts.