If we have the mean time (lifetime) 𝛕 in the electron transition of an atom from the excited state to the ground

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If we have the mean time (lifetime) 𝛕 in the electron transition of an atom from the excited state to the ground state

For 𝛕=10^(-8)sec, find the linewidth Δf of the spectrum using the uncertainty principle.

When the wavelength on the spectral line is 500 nm, find the fractional broadening Δf/f0 of the line width (natural line width).