(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

1. The problem statement, all variables and given/known data

The temperature of the surface of a certain star is 8000 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.

2. Relevant equations

Kb = 1.38e-23 J/K

1/T = E/Kb

3. The attempt at a solution

I don't really know how to do this problem. My guess was to divide the energy in joules by the temperature and then divide by the boltzmann constant to make it unitless.

(1.632e-18/8000)/(1.38e-23)=14.8

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# Homework Help: Fraction of Hydrogen Atoms in First Excited State

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