The features of hydrogen spectrum: discontinuous spectrum (line spectrum) the frequency of the visible line spectrum meets with the following empirical equation: =280(分为 n=3 red红(Ha) n=4 blueness青(Hβ) n=3,4,5,6,.. n=5 blue-purple蓝紫Hy) n=6 purple紫(Hδ) But what does 2,n,3.289X 1015 mean in the empirical equation?Unclear at that time• discontinuous spectrum (line spectrum) • the frequency of the visible line spectrum meets with the following empirical equation: 1 2 2 15 )s 1 2 1 3.289 10 (     n v n= 3,4,5,6, … But what does 2，n，3.289×1015 mean in the empirical equation? Unclear at that time The features of hydrogen spectrum： n = 3 red 红（Hα ） n = 4 blueness 青（Hβ ) n = 5 blue-purple 蓝紫(Hγ ) n = 6 purple 紫（Hδ )