NTNUJAVA Virtual Physics LaboratoryEnjoy the fun of physics with simulations! Backup site http://enjoy.phy.ntnu.edu.tw/ntnujava/
April 20, 2021, 03:04:32 pm

"In theory, theory and practice are the same. In practice, they are not." ..."Albert Einstein (1879~1955, Mathematical physicist, Nobel Prize 1921-Physics)"

 Pages: [1]   Go Down
 Author Topic: Double Slit Wave-Particle Duality Model Open Source Physics Java Applet  (Read 8883 times) 0 Members and 1 Guest are viewing this topic. Click to toggle author information(expand message area).
lookang
Moderator
Hero Member

Offline

Posts: 1796

http://weelookang.blogspot.com

 « Embed this message on: July 05, 2013, 09:24:34 am »

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

Embed a running copy of this simulation

Embed a running copy link(show simulation in a popuped window)
Full screen applet or Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list
• Please feel free to post your ideas about how to use the simulation for better teaching and learning.
• Post questions to be asked to help students to think, to explore.
• Upload worksheets as attached files to share with more users.
Let's work together. We can help more users understand physics conceptually and enjoy the fun of learning physics!

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
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

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.

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 620 times.) Logged
lookang
Moderator
Hero Member

Offline

Posts: 1796

http://weelookang.blogspot.com

 « Embed this message Reply #1 on: July 05, 2013, 09:25:03 am »

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
 Logged
 Pages: [1]   Go Up
"In theory, theory and practice are the same. In practice, they are not." ..."Albert Einstein (1879~1955, Mathematical physicist, Nobel Prize 1921-Physics)"