AST101Lab7 - Astronomy 101 Online Spectra Note: You will...

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Note: You will need to use the Html format version in Angel to access the images for this lab. Objectives : The purpose of this lab is to observe the various wavelengths of light produced under the following circumstances: 1) by a hot solid (a lamp filament) 2) by a hot, low-density gas 3) by light from a blackbody passing through a cool gas Procedure : Part A : In this part of the lab, you will be observing a light bulb connected to a small transformer. The transformer allows the electrical current to be varied into the bulb. If the setting on the transformer is low, the temperature of the filament in the bulb is relatively low and the filament is also not bright. If the setting is high, the temperature and brightness of the bulb will be high. You will analyze the light coming from the bulb using a spectroscope. You can see a picture of the spectroscope here . Light passes into a slit in the spectroscope and the light passes through a diffraction grating to spread the light into its colors. These colors of the spectrum show up against a wavelength scale. The scale denotes the wavelengths of the light in a unit called the Angstrom, where each 1 Angstrom = 10 -10 meters. When the transformer is turned to 70 and the lamp is turned on, you will see the view in Picture 1 . 1 . With the bulb shining brightly, what color does the bulb appear to be? Blue _____________ Look at Picture 2 . You will find the view through the spectroscope of the lamp from picture 1. 2 . Describe what you see in picture 2. Which color is brightest?Green Now may be a good time to remind you that there are three kinds of spectra. A continuous spectrum is one which a complete band of colors - one color blending seamlessly into another without any gaps (black lines) in the spectrum. An emission line spectrum has a black background with bright emission lines of color on top. An absorption line spectrum has a colored background that is broken by dark lines. 3
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This note was uploaded on 10/06/2008 for the course ASTRO 100 taught by Professor Kaler during the Fall '08 term at University of Illinois at Urbana–Champaign.

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AST101Lab7 - Astronomy 101 Online Spectra Note: You will...

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