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| Wave Particle Duality JavaScript HTML5 Applet Simulation Model by Wolfgang Christian, Loo Kang Wee and Tina Tan |
EJSS Double Slit Wave Particle Duality Model
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Double Slit Wave Particle Duality when there are 2 slits, interference pattern is observed on the screen, despite shooting one electron at a time
http://weelookang.blogspot.sg/2015/08/ejss-double-slit-wave-particle-duality.htmlrun: Link1, Link2 download: Link1, Link2 source: Link1, Link2 author: Wolfgang Christian, lookang, tina author EJS: Francisco Esquembre |
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Double Slit Wave Particle Duality when there are 1 slit, interference pattern is NOT observed on the screen, where electron now exhibit particle nature tavelling in straight line path.
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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) ∝ cos² ( πd sinϑ / λ ) sinc²(πd sinϑ / 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:
Credits
This EJSS JavaScript version is developed by lookang based on Wolfgang's EJS model. The original Double Slit Wave-Particle Duality Model was developed by Wolfgang Christian using the Easy Java Simulations (EJS) version 4.3 authoring and modeling tool.
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