conductivity lab

conductivity lab - Chem 124 Fall 2009 Dr. Nguyen Name:...

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Chem 124 Fall 2009 Dr. Nguyen Name: Olivia Nixon Computer #: 25 Partner: Austin Diec 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 9 th . You are to fill in the appropriate spaces using Microsoft Word to create a clear and informative report. 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 and copy of prelab. 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. Comparison Between Temperature of a Choke Coil and Resistance Temperature Resistance ( ) Room Temperature 156.4 Cold Temperature 19.6 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. As the temperature of the choke coil was reduced by submerging it in N 2 , the resistance of the choke coil decreased. The choke coil was cooled so much that ice formed on the choke coil. From this it can be concluded that resistance decreases as temperature decreases. It can also be concluded that as temperature decreases, conductivity increases. This is because conductivity increases as resistance decreases.
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Chem 124 Fall 2009 Dr. Nguyen 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. Observations and Calculations of Different LED Compositions when Submerged in N 2 (liquid) LED Composition P content, in % Measured Voltage Observed Color Energy, J Wavelength (nm) GaP 1.00 As 0.00 100 2.039 Green 3.27 x 10 -19 608 GaP 0.85 As 0.15 85 1.924 Yellow 3.08 x 10 -19 645 GaP 0.65 As 0.35 65 1.894 Orange 3.03 x 10 -19 656 GaP 0.40 As 0.60 40 1.756 Red 2.81 x 10 -19 707 Show a sample calculation of each of the following: 1. Energy in J 1.602 x 10 -19 J / volt = energy GaP 1.00 As 0.00 = 2.036 volts 2.039 volt x 1.602 x 10
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conductivity lab - Chem 124 Fall 2009 Dr. Nguyen Name:...

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