Solution to task 626 from Chertov's for extramural stud

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• The average lifetime of an atom in an excited state is Δt ≈ 10-8 s. At the transition of an atom to the normal state, it is emitted by a photon, the average wavelength of which is 600 nm. Estimate the width Δλ of the emitted spectral line, if it does not broaden due to other processes.