Chemistry - Atomic Structure Question with Solution | TestHub

In a sample of excited hydrogen atoms, electrons make transition from$\mathrm{n}=2$to$\mathrm{n}=1$. Emitted quanta strike on a metal of work function$\left[\mathrm{\varphi }\right]$4.2 ev. Calculate the wavelength (in$\mathrm{Å}$) associated with ejected electrons having maximum kinetic energy.