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\section{Introduction}  Bohr's theory is one of the most important models in modern physics, and it was first confirmed experimentally by James Franck and Gustav Hertz in 1914. Bohr model suggests that electrons only occupy discrete energy levels, which is a significant modification of classical physics. In this lab, we reproduced the Franck Hertz experiment with mercury argon  and neon atoms. \newline \indent fr The apparatus of Franck Hertz experiment is shown in Figure 1. Argon tube and neon tube are used in this experiment. Within each tube, there is a filament, a control grid, an accelerating grid, and an anode.