lampspectra - Blackbody and Emission-Line Spectra In...

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Original worksheet by D. Perley Blackbody and Emission-Line Spectra In today's exercise we will look at examples of blackbody and emission-line spectra with a diffraction grating – a simple device that breaks light into its component colors, allowing us to "see" spectral features. Part 1 – Blackbody spectrum First of all, look through the diffraction grating at an ordinary light bulb. You should see a horizontal band of color some distance off to the side of the object. 1. Sketch this band as best you can in the box, indicating the relative arrangement and sizes of the regions of different colors. 2. Translate this into a rough diagram of wavelength versus intensity. Make sure you note on your graph whether you have wavelength increasing to the right or left. 3. Explain why the bulb looks white. Part 2 – Emission Spectra Next, we will look at the spectra of different elements using the arc lamp, a simple device that passes an electric current through a gas-filled tube.
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