Calculate the time for an atomic system for which that system can have the excitation energy for
the spectral line of width 10-4Å at wavelength 6000Å.
E=hν=hcλ=0.33⋅10−18 J.E=h\nu=\frac{hc}{\lambda}=0.33\cdot 10^{-18}~J.E=hν=λhc=0.33⋅10−18 J.
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