Physics307L F08:People/Dougherty/Notebook/071001
SJK 00:50, 12 October 2007 (CDT)
Experiment 1 Results
UV plot
http://openwetware.org/images/2/26/Untitled.JPG
Blue-Violet plot
http://openwetware.org/images/f/fb/Blue_violet.JPG
Green plot
http://openwetware.org/images/8/80/Green.JPG
Yellow 1 plot
http://openwetware.org/images/6/6a/Yellow1.JPG
Yellow 2 plot
http://openwetware.org/images/e/e8/Yellow_2.JPG
Experiment 2 Results
SJK 00:40, 12 October 2007 (CDT)
http://dev.physicslab.org/Document.aspx?doctype=3&filename=AtomicNuclear_PhotoelectricEffect.xml
Photoelectric Effect/Stopping Potential Relations
Graphs
SJK 00:42, 12 October 2007 (CDT)
http://openwetware.org/images/4/4c/1st_1st.JPG
h = 6.92*10^-34 J [math]\displaystyle{ W_0 }[/math] = 2.373*10^-19 J
http://openwetware.org/images/9/99/1st_2nd.JPG
h = 6.99*10^-34 J [math]\displaystyle{ W_0 }[/math] = 2.416*10^-19 J
http://openwetware.org/images/5/55/2nd_1st.JPG
h = 7.32*10^-34 [math]\displaystyle{ W_0 }[/math] = 2.587*10^-19 J
http://openwetware.org/images/e/ed/2nd_2nd.JPG
h = 7.29*10^-34 J [math]\displaystyle{ W_0 }[/math] = 2.569*10^-19 J
Mean Value
h = 7.13*10^-34 [math]\displaystyle{ W_0 }[/math] = 2.48625*10^-19 J
Standard Deviation
- [math]\displaystyle{ s = \sqrt{\frac{1}{N-1} \sum_{i=1}^N (x_i - \overline{x})^2} }[/math]
[math]\displaystyle{ s }[/math] = 2.04450484*10^-35
Standard Error of the Mean
SJK 00:45, 12 October 2007 (CDT)
- [math]\displaystyle{ s = \sqrt{\frac{1}{N-1} \sum_{i=1}^N (x_i - \overline{x})^2} }[/math]
- [math]\displaystyle{ SE = \frac{s}{\sqrt{N}} }[/math]
SE = 1.02225242*10^-35
"Planck's Constant"
7.13*10^-34 +/- 1.02225242*10^-35
Error
SJK 00:45, 12 October 2007 (CDT)
[math]\displaystyle{ %error= \frac{|Actual-Experimental|}{|Actual|}x100 }[/math]
%error = 7.54%
reasons for errors
SJK 00:32, 12 October 2007 (CDT)
light filtering in from other sources
bad filters on the apparatus
bad volt meter