1. The problem statement, all variables and given/known data The spectrum of a distant star shows that one in 3x106 of the atoms of a particular element in its first excited state 7.3 eV above the ground state. What is the temperature of the star? (You can ignore the other excited states and assume the ratio of statistical weights is 4) 2. Relevant equations (N2/N1) = e-(E2-E1)/KbT) 3. The attempt at a solution All variables are given to plug into the equations but it won't work. Kb is Boltzmann constant. I used the difference in energies as 7.3 eV. I used N2 / N1 as 4. I know how to solve log equations. I don't understand what else needs to be done here though. I've also tried to divide the final answer by 3x106 because I figured that would scale this down to one atom instead of many, but that is not correct.