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\section{Introduction}  Bohr's theory is one of the most important early  models in modern physics, quantum mechanics,  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. The purpose of this lab is to reproduce the Franck Hertz experiment with argon and neon atoms, and to see whether the lab results are consistent with the theoretical values. \newline