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Author Topic: Double Slit Wave-Particle Duality Model Open Source Physics Java Applet  (Read 6586 times)
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lookang
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on: July 05, 2013, 09:24:34 am » posted from:SINGAPORE,SINGAPORE,SINGAPORE

Double Slit Wave-Particle Duality Model Open Source Physics Java Applet by Wolfgang Christian

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Double Slit Wave-Particle Duality Model Open Source Physics Java Applet Wolfgang Christian
http://weelookang.blogspot.sg/2013/07/young-double-and-multi-slits-java.html
author: Wolfgang Christian and lookang, took some ideas from andrew duffy laser diffraction
original work here http://www.compadre.org/osp/items/detail.cfm?ID=11546
many thanks to fu-kwun hwang for teaching me so many things on NTNU java forum
https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejs_DoubleSlitWaveParticleDualitywee.jar


description taken from http://www.compadre.org/osp/items/detail.cfm?ID=11546

The Double Slit Wave-Particle Duality Model demonstrates how matter and light display both wave- and particle-like properties in single and double slit experiments. The simulation shows a detector screen placed behind an aperture with one or two open slits. Particles (electrons or photons) pass through the experiment one at a time and their impact is recorded on the screen. Although it is at first difficult to discern a pattern, a diffraction (interference) pattern eventually emerges suggesting that each particle is interfering with itself. The particle seems be going through both slits as if it were a wave but is detected (observed) at only one location as if were a particle. The particle is interfering with itself as if it were simultaneously passing through both slits.

The Double Slit Wave-Particle Duality Model was created using the Easy Java Simulations (EJS) modeling tool. It is distributed as a ready-to-run (compiled) Java archive. Double click the ejs_qm_DoubleSlitWaveParticleDuality.jar file to run the program if Java is installed.



writeup taken from http://www.compadre.org/osp/items/detail.cfm?ID=11546
Double Slit Wave-Particle Duality

The Double Slit Wave-Particle Duality Model demonstrates how matter and light display both wave- and particle-like properties in single and double slit experiments. The simulation shows a detector screen placed behind an aperture with one or two open slits. Particles (electrons or photons) pass through the experiment one at a time and their impact is recorded on the screen. Although it is at first difficult to discern a pattern, a diffraction (interference) pattern eventually emerges suggesting that each particle is interfering with itself. The particle seems be going through both slits as if it were a wave but is detected (observed) at only one location as if were a particle. The particle is interfering with itself as if it were simultaneously passing through both slits.



Classical wave theory predicts the Fraunhofer diffraction pattern I(θ) if the viewing distance is large compared to the slit width D or slit separation d.


I(θ) ∝ cos^2( π d sin θ / λ) sin ^2 ( π d sin θ / λ )
  


Quantum mechanics interprets I(θ) as the probably of finding the particle (photon or electron) striking the screen. Photons or electrons can each behave like particles or waves, but not at the same time.
References
Stefano Frabboni, Cesare Frigeri, Gian Carlo Gazzadi and Giulio Pozzi, "Two and three slit electron interference and diffraction experiments," Am. J. Phys. 79 (6) 615-618 (2011).
Bradley S. Ambrose, Peter S. Shaffer, Richard N. Steinberg and Lillian C. McDermott, "An investigation of student understanding of single-slit diffraction and double-slit interference," Am. J. Phys. 67 (2) 146-155 (1999).
Credits:

The Double Slit Wave-Particle Duality Model was developed by Wolfgang Christian using the Easy Java Simulations (EJS) version 4.3 authoring and modeling tool.



You can examine and modify a compiled EJS model if you run the model (double click on the model's jar file), right-click within a plot, and select "Open EJS Model" from the pop-up menu. You must, of course, have EJS installed on your computer. Information about EJS is available at: and in the OSP ComPADRE collection


* duality_2013-07-05_1017.png (86.22 KB, 1061x729 - viewed 378 times.)
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lookang
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Reply #1 on: July 05, 2013, 09:25:03 am » posted from:SINGAPORE,SINGAPORE,SINGAPORE

changes made:

flip the detection over time to the right panel instead of the original center panel
draw the world view in the center panel
added the aperture with slits with left and right
added the trail of electron or photon travelling from source gun of electron or photon to screen
made the control panel to suit my usual design
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