LEDRpt - Chem 124 Fall 2006 Name: Cameron Kirby Partner:...

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Chem 124 Fall 2006 Name: Cameron Kirby Computer #: 21 Partner: Kelly Cordeiro Conductivity: LED Experiment Instructions: Each person is to submit an individual report after performing the experiment. This report is due at the beginning of class on Monday November 20 th or Tuesday November 21 st (depending on your lecture day) . You are to fill in the appropriate spaces using Microsoft Word to create a clear and informative report (typed with only one exception: z-diagrams can be drawn in neatly by hand ). To draw attention to your answers, you may want to use color or bold type . Be sure to keep your answers and graphs within the allotted spaces (some resizing may be necessary on your part). You will turn in a hard copy of this report. Part 1: Temperature Dependence of Resistance, R, of a Metal In the table below, record the results of your measurements of resistance for each temperature you recorded. Be sure to title your table appropriately. Dependence of Resistance, R, of a Metal Temperature Resistance ( ) Room Temperature 160 Cold Temperature 10 1. Describe what you observed, i.e., how does resistance change with temperature? Explain why resistance of a metal changes as it does with temperature. We observed that as temperature decreases so does the resistance. This is because when temperature of a metallic object is decreased, the metallic object becomes more crystal like, and therefore becomes more organized. When metal is more organized the electrons have fewer obstacles to go through to get to the opposing end of the metal. This means that there is less resistance in the metal.
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Chem 124 Fall 2006 Part 2: Band Gap of a Compound Semiconductor LED: Effect of Composition In the table below, record the results of your observed values of voltage and color and your calculated values for the energy and wavelength. Be sure to title your table appropriately.
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LEDRpt - Chem 124 Fall 2006 Name: Cameron Kirby Partner:...

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