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The temperature of the surface of a certain star is 7500 K. Most hydrogen atoms at the surface of the star are in the electronic ground state.

The temperature of the surface of a certain star is 7500 K. Most hydrogen atoms at the surface of the star are in the electronic ground state. What is the approximate fraction of the hydrogen atoms that are in the first excited state (and therefore could emit a photon)? The energy of the first excited state above the ground state is (-13.6/22 eV) - (-13.6 eV) = 10.2 eV = 1.632e-18 J.

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