Question: The energy difference between the lowest electronic state ({ }^{1} S_{0}) and the first excited state ({ }^{3} S_{1}) of the helium atom is (159,843

The energy difference between the lowest electronic state ${ }^{1} S_{0}$ and the first excited state ${ }^{3} S_{1}$ of the helium atom is $159,843 \mathrm{~cm}^{-1}$. Evaluate the relative fraction of the excited atoms in a sample of helium gas at a temperature of $6000 \mathrm{~K}$.

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