Chemistry - Atomic Structure Question with Solution | TestHub

An electron in a hydrogen atom is excited to the $\mathrm{n}=3$ energy level and remains in this excited state for an average lifetime of $2\times 10^{-8}\mathrm{s}$ before undergoing a direct transition to the $\mathrm{n}=2$ level, emitting a photon belonging to the Balmer series. Assuming the minimum uncertainly relation applies, the natural line width $\Delta \lambda$ of the emitted spectral line is given as $\mathrm{y}\times 10^{-15}\mathrm{m}$, calculate the value of y , using $\mathrm{R}=1.1\times 10^7{\mathrm{m}}^{-1}$ and h $=6.6\times 10^{-34}\mathrm{J}.\sec$.