Lab Report seven sample for Physics 204. Includes extended descriptions for Introduction, Methods, Calculations, Discussion, and Conclusion to help ensure full marks in your reports. Please beware plagiarism as you look the document over and for any questions, refer to your TA.
Spectroscopy is defined as a process and lab technique that allows us to obtain a
spectrum, a graph depicting the intensity of a certain signal or physical process at different
wavelengths or energies. In our lives, spectroscopy can be used to assess the physical
characteristics of a substance and identify it using its base characteristics. In our daily lives,
spectroscopy can be used to do color matching by home improvement associates and to measure
the amount of smog in the air using specialized instruments. In the life sciences, spectroscopy is
an important technique in the lab that can allow you to identify the levels of a specific compound
in specimen.
When it comes to analyzing spectrums in graphical form, the most important feature to
notice are the peaks of the graph and their characteristics: where the peak forms, how sharp it is,
how many peaks there are, and so on. The main idea behind this lab was to learn how to measure
the spectrum of a light source using a spectrometer, and to create a graph of it using software and
learn to analyze it.
Procedure:
First, the warmup exercise was done, and a spectrum was collected from a Mercury
Vapor Lamp. The lamp was positioned so that the end of the fiber optic collector was directly in
front of the little hole in the front, following the set up shown in Figure 1. The lamp switch was
pressed so a little blue glow could be seen coming from the hole in the front. The OceanView
application was opened on the computer and put in Quick View mode. A spectrum was created
in the graph section and its corresponding data was recorded.
, 2
Figure 1: Basic set up for the warmup exercise and other experiments.
Next, Experiment 1: Measure the Spectrum of Helium was done. First the Helium
discharge tube was put in the tube holder. The spectrometer and cable were set up as in Figure 1.
The power supply was turned on to make sure it was glowing, and the collector was adjusted.
The pause button was pressed on the computer to pause data collection and the power was turned
off. The wavelength of the largest peak from the spectrum obtained was noted (Data). The
spectrum data was also recorded.
Lastly, Experiment 2: Hydrogen Line was done. A prediction was made of the
wavelength for the 3 to 2 transition wavelength and noted down (Data). Next, the same steps as
in Experiment 1 was repeated to obtain the spectrum data for the Hydrogen discharge tube.
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