<p> SPECTRA OF ELEMENTS LAB</p><p>Part I. Spectra of selected elements </p><p>Sample Spectrum R O Y G B V Hydrogen</p><p>R O Y G B V Helium</p><p>R O Y G B V Neon</p><p>R O Y G B V Argon</p><p>R O Y G B V Krypton</p><p>R O Y G B V Xenon</p><p>R O Y G B V Mercury</p><p>R O Y G B V Nitrogen Part II Fluorescent lights vs. incandescent lights</p><p>1. Look carefully through a diffraction grating at an incandescent light. Concentrate on the red and violet ends of the spectrum. Do you see more red or more violet?</p><p>Does fabric swatch 1 look blue or purple?</p><p>Does fabric swatch 2 look red or maroon?</p><p>2. Now look at a fluorescent light. Do you see more red or more violet?</p><p>Does fabric swatch 1 look blue or purple?</p><p>Does fabric swatch 2 look red or maroon?</p><p>3. Use the spectroscope to look at the fluorescent light. Although you will see all colors of light, you should also see a few brighter lines. This is the spectrum of an element used in fluorescent light bulbs. R O Y G B V</p><p>Identify which element this is by comparing this spectrum with those in the data table on the first page.</p><p>Conclusions:</p><p>1. Use your answers to Part II, questions 1 and 2, to explain why fabrics sometimes look one color in the store and a different color (or shade) when you get the clothes home.</p><p>2. Why are the atomic spectra line spectra rather than continuous spectra (i.e. only some lines rather than a full “rainbow”)?</p>