12/18/2023 0 Comments Light emission spectrum![]() Instead, aim your instrument at the light bouncing off of a white wall. You can also examine sunlight, though you should NEVER LOOK DIRECTLY AT THE SUN THROUGH YOUR SPECTROSCOPE. Some other light sources to examine are a candle flame, a flashlight, yellow street lights, blue street lights, the flame from a Bunsen burner, a camping lantern and neon signs. A fluorescent bulb produces distinct colored lines because it contains mercury vapor. Look for specific colors and notice the spacing between the colored lines.Īn incandescent light bulb produces a continuous spectrum because it is a heated solid – a tungsten filament. (Image credit: Nola Taylor Redd) Using your spectroscopeĪ good science fair project using your spectroscope is testing the hypothesis that different gases produce different spectra of light.Īim your spectroscope at various light sources. Insert tube into oval, then use aluminum tape or foil to seal up any part of the box where light can enter. The completed, light-sealed spectrometer. Use a pen to trace the circle in the middle of the CD. Set the CD on top of the box, about a half an inch from the left edge on the side you intend to place the tube. Step 1: Begin by making a hole for the viewing tube. The CD will help to ensure that the three elements line up correctly. ![]() Light will enter your spectroscope through a small slit (the diffraction grating), reflect off the CD, and be seen through the viewing tube. Aluminum tape or aluminum foil and glue: Aluminum tape can be found in most hardware stores, but standard foil from your kitchen and glue work effectively.A cardboard tube: A toilet paper tube or part of a paper towel or gift wrap tube works fine larger tubes would, of course, need to be cut to a more manageable size.Some websites suggest using two single-edged razor blades, which would be thicker and certainly be straight, but paper cards are more child-friendly. One or two business cards/3x5 cards: Business cards are thicker than standard index cards, so I felt they would let less light through.A DVD or CD: You won't be getting it back, so make sure it's one you don't mind losing.I used a medium priority shipping box, but small shipping boxes, shoe boxes or cereal boxes will work just as well. A cardboard box: The box needs to be large enough to contain a CD or DVD.(Image credit: Nola Taylor Redd) Materials needed ![]() For aspect ratios of 2.3 and 3. The needed tools, all of which should be relatively easy to find around the house. The spectra of light emission from all three AuNR suspensions show a broad peak near 525 nm. ![]()
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