deletions | additions       diff --git a/Ordinary text and paragraphs.tex b/Ordinary text and paragraphs.tex  index 53dc118..97141ea 100644  --- a/Ordinary text and paragraphs.tex  +++ b/Ordinary text and paragraphs.tex 
...
\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 The purpose of  this lab, we reproduced lab is to reproduce  the Franck Hertz experiment with argon and neon atoms. atoms, and to see whether the lab results are consistent with the theoretical values.  \newline 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, a cathode  and an anode. An accelerating voltage is applied between cathode and accelerating plate to provide electrons with kinetic energy. A retarding voltage is applied between anode and accelerating plate to attract more electrons to the anode. Control grid is necessary for argon and neon, but will be unnecessary for some atoms such as mercury. The function of the control grid is to attract more electrons from the filament.