User:Ryan P. Long/Notebook/Physics 307L/2009/10/26: Difference between revisions
Ryan P. Long (talk | contribs) No edit summary |
Ryan P. Long (talk | contribs) No edit summary |
||
Line 1: | Line 1: | ||
{|{{table}} width="800" | {|{{table}} width="800" | ||
|- | |- | ||
|style="background-color: #EEE"|[[Image:owwnotebook_icon.png|128px]]<span style="font-size:22px;"> | |style="background-color: #EEE"|[[Image:owwnotebook_icon.png|128px]]<span style="font-size:22px;"> Millikan Oil Drop Experiment Round 2</span> | ||
|style="background-color: #F2F2F2" align="center"|<html><img src="/images/9/94/Report.png" border="0" /></html> [[{{#sub:{{FULLPAGENAME}}|0|-11}}|Main project page]]<br />{{#if:{{#lnpreventry:{{FULLPAGENAME}}}}|<html><img src="/images/c/c3/Resultset_previous.png" border="0" /></html>[[{{#lnpreventry:{{FULLPAGENAME}}}}{{!}}Previous entry]]<html> </html>}}{{#if:{{#lnnextentry:{{FULLPAGENAME}}}}|[[{{#lnnextentry:{{FULLPAGENAME}}}}{{!}}Next entry]]<html><img src="/images/5/5c/Resultset_next.png" border="0" /></html>}} | |style="background-color: #F2F2F2" align="center"|<html><img src="/images/9/94/Report.png" border="0" /></html> [[{{#sub:{{FULLPAGENAME}}|0|-11}}|Main project page]]<br />{{#if:{{#lnpreventry:{{FULLPAGENAME}}}}|<html><img src="/images/c/c3/Resultset_previous.png" border="0" /></html>[[{{#lnpreventry:{{FULLPAGENAME}}}}{{!}}Previous entry]]<html> </html>}}{{#if:{{#lnnextentry:{{FULLPAGENAME}}}}|[[{{#lnnextentry:{{FULLPAGENAME}}}}{{!}}Next entry]]<html><img src="/images/5/5c/Resultset_next.png" border="0" /></html>}} | ||
|- | |- |
Revision as of 16:58, 8 November 2009
Millikan Oil Drop Experiment Round 2 | <html><img src="/images/9/94/Report.png" border="0" /></html> Main project page <html><img src="/images/c/c3/Resultset_previous.png" border="0" /></html>Previous entry<html> </html>Next entry<html><img src="/images/5/5c/Resultset_next.png" border="0" /></html> | |||
Note: My partner Tom and I share the same lab notebook up to the Analysis section EquipmentPictures from the Original Experiment
Pictures from the Continuation
Equipment used in both the original experiment and the followup
New equipment
Note: We forgot to write down the model numbers of the Logitech, Creative, and CCD cameras, but we will get this information the next time we are in the lab Week 1- No CameraSetupFirst, we tried using the Creative and Logitech webcams to see the droplets and take data. Then we ended up just following the procedure we used in the original experiment. DataFirst, we set up the Logitech camera. The focusing wire was easily seen, but the gridlines were hard to make out due to the camera's low resolution. We tried the same thing with the Creative camera, but again, the gridlines were hard to distinguish from one another. After putting the drops in for both cameras, the light was not bright enough to see anything, despite changing cameras' integration times, contrast, and brightness settings. After our attempts with the cameras yielded no data, we took data in a similar fashion as the original experiment: we squirted some mineral oil into the chamber with the ionization source set to the spray droplet position. We then turned it off, played with the capacitor plates until we found a suitable drop, and proceeded to time it as it rose with the force of the electric field and fell due to gravity. We did not repeat our previous mistake of measuring the fall time of the droplet WITH the electric field on. Raw data sheet: {{#widget:Google Spreadsheet |
key=tdqXMh97xXnU0W-obvdhVEA | width=650 | height=300
}} I decided to name our droplets for added excitement AnalysisThough I couldn't put it into words at the time, I think the reason the gridlines were hard to make out using the cameras was that the gridlines were spaced so close together on the camera screen that sometimes multiple lines would be seen by the same pixel. This would explain the random spacing of what appeared to be "darker" lines rather than the thicker lines spaced every .5 mm apart. As in the first experiment, the pressure was not measured but was calculated using a pressure calculator and some conversion factors given the fact that UNM is located at about 5335 feet above sea level according to UNM's soccer page. The charge was calculated using the formula on page 9 in the Pasco Manual. The accepted value of the charge of a single electron is (from wikipedia): e = [math]\displaystyle{ 1.602176487(40) \cdot 10^{-19} }[/math]C Week 2- CameraSetupFor the second week we intended to use a camera to make the data taking process easier to see, and possibly more precise due to the use of recording and the ability to analyze the data frame by frame instead of using a stop watch. First, we set up my video camera to look at the droplets. Before moving to the next camera, we removed the lamp housing with the incandescent bulb in it and replaced it with LED light. We tried to view it again with my camera. Finally we set up the 2" lens behind the eyepiece and put the CCD camera at a distance about 10 cm away (we moved it until it looked to be most in focus).
|