experiment#8 - LiemT. Tran Chem. 001A Lab report # 8...

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LiemT. Tran Chem. 001A Lab report # 8 Experiment #8 Colorful Atoms Three things I have learn from this experiment The 60 watt incandescent light has higher intensity than the 40 watt incandescent light since the “60watt” incandescent light is brighter than the one with 40 watt. For the incandescent light bulb, all of seven colors ROYGBIV would appear when we observed it through the spectroscope. In order to find wavelength of hydrogen spectrum, we have to plug “scale reading” in the calibration equation, then we will get the value of wavelength. Investigation 1. White light : What is called "light" is another term for electromagnetic radiation. White light is the combination of all of the frequencies within the visible light spectrum of electromagnetic radiation. Until Newton's work became accepted, most scientists believed that white was the fundamental color of light; and that other colors were formed only by adding something to light. Newton demonstrated this was not true by passing white light through a prism, then through another prism. If the colors were added by the prism, the second prism should have added further colors to the single-colored beam. Since the single-colored beam remained a single color, Newton concluded that the prism merely separated the colors already present in the light. White light is the effect of combining the visible colors of light in equal proportions. 2. Incandescent and fluorescent lamps Design : Incandescent lamp : Modern incandescent lamps come in a huge variety of shapes and sizes, but all share the same basic elements. Each is contained by a glass or quartz sphere or envelope. A current enters the lamp through a conductor in an airtight joint or joints. Wires carry the current to the filament, which is held up and away from the bulb by support wires. Filaments are made of coiled tungsten, a high-resistance material that can be drawn into a wire. Tungsten also has a higher resistance when it is hot than when it is cold. The filament shape and length are also important to the efficiency of the lamp. Most filaments are coiled, and some are double-and triple-coiled. This allows the filament to lose less heat to the surrounding gas as well as indirectly heating other portions of the filament. Most lamps have one screw-type base, through which both wires travel to the filament. The base is cemented to the bulb. The bulb may be made from either
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experiment#8 - LiemT. Tran Chem. 001A Lab report # 8...

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