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\section{Experiment}  A typical arrangement of the Franck-Hertz experiment consists of an electron-emitting filament and a means of accelerating electrons to a variable potential. Accelerated electrons then bombarded atoms of the element, which are in a gaseous state. These accelerated electrons can either collide elastically or inelastically with atoms of the given element. Slowly moving electrons will collide elastically with atoms, which will change the path of the electron, but not its speed. Since the path of an electron that has undergone an elastic collision changes, the amount of time it takes the electron to reach the anode increases, but since its speed should not change the kinetic energy of the electrons should not change. When electrons have been accelerated to a potential that is equal to the discrete energy of the first excited level, collisions with atoms of the element become inelastic. The speed of the electron will decrease,which corresponds to a decrease in kinetic energy. Furthmore the collision should excite the atom. In order to detect the loss of kinetic energy, a small retarding potential exists before the anode, so that electrons that have lost most of their energy will not be able to overcome it, and thus will not reach the region of collection. This should correspond to a decrease in current of the electron beam. Thus in order to detect the excitation of atoms, and the subsequent drop in kinetic energy, the current of electron beam can be observed.   \begin{figure}[h]  \caption{Example of a parametric plot ($\sin (x), \cos(x), x$)}  \centering  \includegraphics[width=8cm]{Argon_Circuit.png}  \end{figure}