conductivity

conductivity - Chem 124 Name: Partner: Winter 2008 Computer...

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Chem 124 Winter 2008 Dr.Hascall Name: Computer #: Partner: 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 Tuesday March 4 th . You must turn in a typed hard copy of this report. Be sure to keep your answers and graphs within the allotted spaces (some resizing may be necessary on your part). 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. Change in Choke Resistance due to change in Temperature Temperature Resistance ( ) Room Temperature 156.5 Cold Temperature 24.1 1. Describe what you observed, i.e., how does resistance change with temperature? Explain why the resistance of a metal changes as it does with temperature. As the temperature decreases, the resistance decreases as well. Resistance decreases because as the metal gets colder, it contracts, causing the atoms to be closer to each other making it easier for them to transfer the energy between themselves. The band gap would be smaller as well, so there is less of a distance to jump over. 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. Effects of Changing the % Phosphorous in an LED
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This note was uploaded on 04/01/2008 for the course CHEM 124 taught by Professor Hascall during the Winter '08 term at Cal Poly.

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conductivity - Chem 124 Name: Partner: Winter 2008 Computer...

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