Physics307L:People/Dougherty/Notebook/071001



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
http://dev.physicslab.org/Document.aspx?doctype=3&filename=AtomicNuclear_PhotoelectricEffect.xml

Photoelectric Effect/Stopping Potential Relations

Graphs
http://openwetware.org/images/4/4c/1st_1st.JPG h = 6.92*10^-34 J   $$W_0$$ = 2.373*10^-19 J

http://openwetware.org/images/9/99/1st_2nd.JPG h = 6.99*10^-34 J   $$W_0$$ = 2.416*10^-19 J

http://openwetware.org/images/5/55/2nd_1st.JPG h = 7.32*10^-34     $$W_0$$ = 2.587*10^-19 J

http://openwetware.org/images/e/ed/2nd_2nd.JPG h = 7.29*10^-34 J   $$W_0$$ = 2.569*10^-19 J

Mean Value
h = 7.13*10^-34    $$W_0$$ = 2.48625*10^-19 J

Standard Deviation


s = \sqrt{\frac{1}{N-1} \sum_{i=1}^N (x_i - \overline{x})^2} $$

$$s$$ = 2.04450484*10^-35

Standard Error of the Mean


s = \sqrt{\frac{1}{N-1} \sum_{i=1}^N (x_i - \overline{x})^2} $$


 * $$SE = \frac{s}{\sqrt{N}}

$$

SE = 1.02225242*10^-35

"Planck's Constant"

7.13*10^-34 +/- 1.02225242*10^-35

Error
$$%error= \frac{|Actual-Experimental|}{|Actual|}x100$$

%error = 7.54%

reasons for errors
light filtering in from other sources

bad filters on the apparatus

bad volt meter