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diff --git a/pe-effect.tex b/pe-effect.tex index d732579..e402a41 100644 --- a/pe-effect.tex +++ b/pe-effect.tex @@ -86,9 +86,9 @@ The Pasco photoelectric effect setup.} \end{figure} Set up the equipment as shown in Fig. \ref{pefig3}. First, place a lens/grating assembly in front of the Mercury -lamp, and observe a dispersed spectrum on a sheet of paper, as shown in Fig.~\ref{pefig4}. Identify spectral +lamp, and observe a dispersed spectrum on a sheet of paper, as shown in Fig.~\ref{fig:mercury_spectrum}. Identify spectral lines in both the first and the second diffraction orders on both sides. Keep in mind that the color -``assignment'' is fairly relative, and make sure you find all lines mentioned in the table in Fig.~\ref{pefig4}. +``assignment'' is fairly relative, and make sure you find all lines mentioned in the table in Fig.~\ref{fig:mercury_spectrum}. Often the first/second order lines on one side are brighter than on the other - check your apparatus and determine what orders you will be using in your experiment. @@ -147,8 +147,9 @@ released. \end{enumerate} \begin{figure}[h] -\centering \includegraphics[width=\linewidth]{./pdf_figs/pefig4} \caption{\label{pefig4} -The Pasco photoelectric effect setup.} +\centering +\includegraphics[width=\linewidth]{./pdf_figs/mercury_diffraction_spectrum} \caption{\label{fig:mercury_spectrum} +The mercury lamp visible diffraction spectrum.} \end{figure} \section*{Part B: The dependence of the stopping potential on the frequency @@ -184,7 +185,7 @@ leaks off. \begin{enumerate} \item -Use the table in Fig.~\ref{pefig4} to find the exact frequencies and wavelengths of the spectral lines you used and plot the measured stopping potential values versus light frequency for of measurements of the first and second order lines (can be on same graph). +Use the table in Fig.~\ref{fig:mercury_spectrum} to find the exact frequencies and wavelengths of the spectral lines you used and plot the measured stopping potential values versus light frequency for of measurements of the first and second order lines (can be on same graph). \item Fit the plots according to $eV_0 = h\nu-\phi$, extracting values for slopes and intercepts. Find average value for slope and its uncertainty. From the slope, determine $h$ counting $e=1.6\cdot10^{-19}$~C. Do your measured values agree with the accepted value of $h=2\pi\cdot 10^{-34}$J$\cdot$s within experimental uncertainty? |