Problem 6.126

Find the ratio of the number of atoms of gaseous sodium in the state \(3 P\) to that in the ground state \(3 S\) at a temperature \(T=\) \(=2400 \mathrm{~K}\). The spectral line corresponding to the transition \(3 P \rightarrow\) \(\rightarrow 3 S\) is known to have the wavelength \(\lambda=589 \mathrm{nm} .\)