Linear Regression Fitting and Graphing Programs
Linefit was written by Cal Poly Computer Science students Joel Onofrio and Kiet Tran. Enter the "x" and "y" values for your data, and the program will plot the data, find the slope and intercepts. The program will also find the uncertainties in these values. You can also change which data is used in the "linear regression fit". Netscape 4.08 or better or IE 4.0 or better is need with this applet.FitIt was written by Cal Poly Computer Science Student Liz Reznak (Sp 2006). It is an improvement of linefit that includes semi-log and log-log fits as well as some polynomial forms. This work was made possible by the WEEA professional development program.
Photon Interference Applet
photon interference was written by Cal Poly students Matt Henderson, Chang Kim and Jason Kang. Just choose the number of windows (or screens) and use the task bars.
photon interference applet was written by Cal Poly students Brian De Wolf, Vern Jensen and Juan Pastor.
oscope was written by Cal Poly students Michael Lee, Benjlyn Lopez and Pascal Huoth. This version has "sliders" along the axis to allow the user to move the signal around. Click "randomize" a few times to get a nice signal. Note, the nice help box.
Oscilloscope was written by Cal Poly students Erik Waibel, James Wong, Devin Smith and Phan Su. This applet doesn't have sliders, but it works very well, and is a good version to start with. There is also a help box.
oscilloscope was written by Cal Poly students Wei Zhao, Mark Soriano and Mihn Truong. This version was the first to use "sliders" to move the signal around. It is well written and simple to use.
Central Force Program
Alkali Energy Level Programs
alkali2 was written by the student group led by Anh Mach. It can run with Netscape 3.0 or better.
alkali1 was written by the student group led ty Xiong (Sean) Lin. It can run with Netscape 4.5 or better.
How to use the Alkali Energy Level Programs
The program calculates the energy levels for the valence electron for the alkali elements. Pick an element from the box. Pick a value of the parameter c (Angstroms). Then click on calculate, and wait for the calculation to finish. First the experimental values of the energy levels (in eV) for the l=0, l=1, and l=2 levels are printed, Then the calculated values are computed and printed. Vary the parameter c (Angstroms) for the best fit to the experimental values.
The program calculated the energy levels as follows: It is assumed that the valence electron experiences a "mean field" potential, V(r), due to the nucleus and the other electrons. The potential V(r) is inserted into the Schroedinger equation, and the code solves Schroedinger's equation for the bound states. The potential V(r) is taken to be the sum of a potential due to a point charge (the nucleus) of magnitude +Ze and a screening potential due to the other (Z-1) electrons in the atom. The screening potential is that due to a uniformly charged sphere of radius c and total charge of -(Z-1)e.
There is a translation of this page in Danish. All links to translations have been removed.
Physics Department| College of Science