spectroscopy lab

spectroscopy lab - Lab IV Atomic Spectroscopy &...

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Lab IV – Atomic Spectroscopy Physics of Music and Color Kelsey Schur 11/1/2007 Introduction In these labs, students investigated aspects of light waves. In Lab IV, Atomic Spectroscopy, we studied the visible radiation of atoms and molecules in a gas discharge tube. In the second half of the lab, students studied double source interference in light waves. In Lab IV, students used a spectrometer to view the spectral lines of various excited gases. A tube of each gas was placed in front of the slit in the spectrometer. The light emitted by the excited gas then passed through a grating inside the spectrometer with 14,500 lines per inch, or 5,708.661lines per centimeter. The grating breaks up the light into its components, the spectral lines. This effect can be seen on a larger scale by holding the grating up to a fluorescent light. One can see the light broken down into a rainbow pattern of its components, just as the light from the excited gas is broken up by the grating inside the spectrometer. The spectral lines are then reflected onto a scale at the back of the spectrometer, from which the wavelengths of lines can be read. For the first two gases, sodium and hydrogen, students simply read the wavelengths and compared them to those given by the lab. For the second two, students read the wavelengths of two unidentified gases and attempted to match them to a given spectrum in order to identify the gases. In the lab dealing with double source interference, students shone a laser through slides with different slits or pieces of silkscreen and then studied the patterns of “fringes,” or bright spots, cast on the opposite wall. By analyzing these patterns, students calculated the distance between the centers of the slits in the slides or holes in the silkscreen. They then considered why the patterns changed with the different samples of silkscreen. For this lab, students needed the following relation to calculate the
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distance between the slits or holes: s = (L/a) λ where s is the distance between the fringes, L is the distance from the wall to the slit or screen, and a is
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This note was uploaded on 03/29/2008 for the course PHY 10 taught by Professor Gunther during the Spring '08 term at Tufts.

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spectroscopy lab - Lab IV Atomic Spectroscopy &...

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