https://www.chegg.com/homework-help/higher-temperature-sources-sodium-atoms-emit-doublet-average-chapter-9-problem-15qp-solution-9780495012016-exc?trackid=b58eaf9c7ec3&strackid=5af13af0bcca&ii=1&event=click_submit

https://www.chegg.com/homework-help/questions-and-answers/show-work-calculate-ratio-sodium-atoms-3p-excited-states-number-ground-state-2500-2510-k-t-q12550401?trackid=492421ed063e&strackid=4b777932e169&ii=3&event=click_submit

https://www.chegg.com/homework-help/questions-and-answers/find-ratio-na-atoms-3p-excited-state--ground-state-2500-k-average-wavelength-two-sodium-em-q5468354?trackid=18be10e4886e&strackid=c76114f64a76&ii=6&event=click_submit

https://www.chegg.com/homework-help/questions-and-answers/na-absorbs-5893-nm-excited-3s-3p-state-calculate-number-excited-state-na-atoms-3p-number-g-q9661369?trackid=3787f31ea8d9&strackid=d848e9615925&ii=6&event=click_submit

https://www.chegg.com/homework-help/questions-and-answers/na-mg-ions-compare-ratios-number-ions-3p-excited-state-number-3s-ground-state-acetylene-ai-q19189632?trackid=61b2612f9d77&strackid=c0139117f345&ii=8&event=click_submit