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\rhead{Earth, Moon, and Planets Lab (Tue 7-10pm)}
\chead{}
\lhead{Exercise set 6}
\renewcommand{\rightmark}{}
\lfoot{Roban Hultman Kramer} \cfoot{\thepage} \rfoot{Spring 2006}

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\begin{document}
\begin{center}
\huge Exercise set six
\end{center}

This week will be all about spectroscopy. I'll start off class with a
brief introduction to line and black-body spectra and how a
spectroscope works, then you'll use spectroscopes to look at a variety
of light sources.

Do all your work in your lab notebooks. I expect everyone to observe
and draw each spectrum individually. 

\textbf{In all of your drawings: try to make clear the distinction
  between sharp and fuzzy lines, bright and faint lines, and regions
  where continuum is bright or faint.}

\section{Lighting Spectroscopy}

\subsection*{Materials} spectroscope

\subsection*{Instructions}

\textbf{For each object listed below:}
\begin{itemize}
\item describe it
\item write down where you found it,
\item draw its visible spectrum,
\item classify its spectrum as emissions line, absorption line,
  blackbody, or other,
\item and explain why the object has that type of spectrum.
\end{itemize}

\noindent Light sources:
\begin{enumerate}

\item As many different kinds of indoor light bulb (or fixture if you
  can't see the bulb) as you can find. Make sure one is an
  incandescent bulb.

\item As many kinds of outdoor lighting as you can find (you can look
  through the windows).

\item A blank wall (record what kind of lighting was present)

\item Something not listed above

\end{enumerate}

Remember that you need a fair amount of light to be able to see a
spectrum. Also make sure your spectrum isn't contaminated by some
other light source.  

\section{Identifying lighting}

\subsection*{Materials} spectroscope, computer with web browser,
observations from exercise one

\subsection*{Instructions}

Do this after exercise one. \textbf{Use the spectra at\\
\url{http://ioannis.virtualcomposer2000.com/spectroscope/amici.html}\\
to try to identify the different kinds on lighting you viewed in
exercise one.}

\section{Spectroscopy of known gasses}

\subsection*{Materials} spectroscope, labeled gas discharge tubes,
printout of gas spectra

\subsection*{Instructions}

I have set up two power sources at a table with several different
gasses in labeled discharge tubes. Remember that, in order to see the
spectrum you need to line the light-source up with the slit. The
spectrum will then appear to one side of the slit. It may take some
practice to get the hang of lining the light source up in the slit.

\textbf{For each gas:}
\begin{itemize}
\item record the name
\item draw its visible spectrum
\item compare its spectrum to the spectrum in the printout (note any
  differences)
\end{itemize}

\section{Spectroscopy of unknown gasses}

\subsection*{Materials} spectroscope, unidentified gas discharge tubes,
printout of gas spectra

\subsection*{Instructions}

I have set up two power sources at a table with several different
gasses in discharge tubes labeled only with a letter. 

\textbf{For each gas:}
\begin{itemize}
\item record the label
\item draw its visible spectrum
\item identify the gas by comparing its spectrum to the spectra in the
  printout, or to the labeled gas tubes on the other table
\end{itemize}

\end{document}