User:Ryan P. Long/Notebook/Physics 307L/2009/09/28: Difference between revisions
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==Data Analysis== | ==Data Analysis== | ||
My value below for q is calculated using the equations on pages 2 and 9 of the pasco manual, my partner, Tom deserves credit for this great spreadsheet below. | My value below for q is calculated using the equations on pages 2 and 9 of the pasco manual, my partner, Tom deserves credit for this great spreadsheet below. | ||
<math>q=\frac{4}{3}\pi\rho g \left[ \sqrt{\left(\frac{b}{2p} \right)^2+\frac{9\eta v_f}{2g\rho }}-\frac{b}{2p}\right]^3</math> | |||
Equation for q from page 10: | |||
<math>q=\frac{4}{3}\pi\rho g \left[ \sqrt{\left(\frac{b}{2p} \right)^2+\frac{9\eta v_f}{2g\rho }}-\frac{b}{2p}\right]^3 \frac{(v_f+v_r)}{Ev_f}</math> | |||
Revision as of 00:48, 12 October 2009
 Millikan Oil Drop
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Note: Tom and I have identical lab notebooks except for the analysis section Equipment
SetupFor our experiment, we followed the instructions listed in the Pasco Manual. We plugged the PSU into the top voltage banana connectors on the Millikan oil drop apparatus. We then took a measurement of the spacing of the capacitor plates using the calipers. The capacitor spacing was 7.6 mm. We also measured the voltage across capacitor plates to be 501.3(1) V using the multimeter (Please note that the .1 V uncertainty corresponds not to the SEM of the voltage but the total range of measurements registered by the multimeter). We then and placed the multimeter probes in the thermistor holes on the oil drop apparatus to measure its resistance throughout the experiment. Before starting the experiment, we had to calibrate the device. First we removed the capacitor plates and rinsed them thoroughly with water. We dried them and replaced them. Then we inserted the focusing wire into the top hole of the capacitor plate. We adjusted the light so that the wire was clearly visible through the scope. We also turned the droplet focusing ring and reticle focusing ring so that both the background grid and the wire were in focus. The device was now calibrated and ready to take data. DataThe procedure of taking data consisted of a few parts. First we turned the ionization source lever to the spray droplets setting. Then we inserted the tip of the squeezer into the top of the chamber and squeezed oil droplets in. Once we were content with the number of droplets in between the capacitor plates, we switched the lever back to off and started taking data. We picked a droplet and timed how long it took to cross 6 sets of 5 major grid lines, with a line spacing of 0.5 mm. This means each droplet traveled a total of 3 mm. To change the direction of the droplet, we used the polarity switch. Raw data sheet: {{#widget:Google Spreadsheet |
key=tjdx2gSg2zxMgph-4UQC6tw | width=1020 | height=280
}} Data AnalysisMy value below for q is calculated using the equations on pages 2 and 9 of the pasco manual, my partner, Tom deserves credit for this great spreadsheet below. Equation for q from page 10: [math]\displaystyle{ q=\frac{4}{3}\pi\rho g \left[ \sqrt{\left(\frac{b}{2p} \right)^2+\frac{9\eta v_f}{2g\rho }}-\frac{b}{2p}\right]^3 \frac{(v_f+v_r)}{Ev_f} }[/math]
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key=t5BlD1hP29ElloydD8ZLVsw | width=1020 | height=300
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