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Double Slit Experiment (Physics)


Double Slit Experiment (Physics)

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Graphical illustration of a double slit experiment. Allows user to change wavelength and slit separation. Includes tools to determine differences in path length between interfering wavefronts.
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Material Type: Simulation
Date Added to MERLOT: July 09, 1997
Date Modified in MERLOT: October 27, 2005


  • Peer review 4 rating
    Peer Reviews: 4 rating
  • User review 4.5 average rating
  • User Rating: 4.5 user rating
  • Discussion (2 Comments)
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Primary Audience: College General Ed
Mobile Compatibility: Not specified at this time
Language: English
Cost Involved: no
Source Code Available: no
Accessibility Information Available: no
Creative Commons: unsure


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Discussion for Double Slit Experiment (Physics)

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Avatar for Barbra Bied Sperling
16 years ago

Barbra Bied Sperling (Staff)

I spent about 10 minutes working with this item. It is a simple and
surprisingly effective qualitative demonstration of the interference of waves
emanating from two slits. The applet is simple to operate, and generally
straight-forward. There are some undocumented features: For example, the user
can click and drag the slits closer together or further apart (however, the
change is not reflected in the "distance" box). Also, clicking the right mouse
button toggles the effect of the left mouse button.
The applet is visually effective, with the regions of maximum interference
clearly visible. Unfortunately, these regions appear white, the opposite from
the black representing matching phase points (e.g., peak values).
As is, the applet is a simple way to illustrate qualitative effects of
constructive interference, although the explanation of a teacher needs to
accompany its use. Its usefulness would be much improved by gray-scale intensity
representation and/or the inclusion of some simple tools or information that
would allow quantitative analysis.

Avatar for John Walkup
17 years ago

John Walkup (Staff)

Simple, clean, and clear. Very nicely done.