NTNUJAVA Virtual Physics Laboratory
Enjoy the fun of physics with simulations!
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"That their main business was not put into the mind knowledge which was not there before, but to turn the mind's eye towards light so that it might see for itself." ...Plato's advice to educators(429-347BC)
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Author Topic: Double slit interference  (Read 185617 times)
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Fu-Kwun Hwang
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on: January 29, 2004, 08:06:23 pm » posted from:,,Satellite Provider

Registed user can get files related to this applet for offline access.
Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list
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  • Each click to thebutton will open a new window. Try it!

  • You can change:

    1. You can change size of the popup window.

    2. distance between slits, initial value = 150


    3. wavelength of plane wave, initial value=15

    4. Hit the "Start" button inside the window will start the animation

    5. You can also drag one of the slit to change distance between slits

    6. If you click or drag the LEFT mouse , the animation suspend. animation resume when it is released.

    7. distances from both slits to the mouse (d1,d2) are shown in the "texField"

      with format "d1 - d2 = path difference" , numbers are divided by wave length

      If you click or drag the LEFT mouse , the animation suspend. Click right mouse button again to resume.

    8. Close the created window to Quit.


    Please chec out Effect of a Medium on a Double Slit Interference Pattern to view spectrum for visible light.

    The following is a demostration with microwave

    http://www.youtube.com/watch?v=kO2yFC7_k2s


    Registed user can get files related to this applet for offline access.
    Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list
    If java program did not show up, please download and install latest Java RUN TIME
    There are 11 translations,
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    * double-slit-water-waves.png (144.29 KB, 226x168 - viewed 7521 times.)
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    Reply #1 on: January 30, 2004, 11:12:43 am » posted from:,,Satellite Provider

    Subject: double-slit applet
    Date: Tue, 25 Aug 1998 14:45:37 -0400 (EDT)
    From: "James Bo Begole" <begolej@simon.cs.vt.edu>
    Reply-To: "James `Bo' Begole" <begolej@vt.edu>
    To: hwang@phy03.phy.ntnu.edu.tw
    I liked to older version of the double slit applet better. The interface
    on the old one was much easier to use, although it was slower to run. I
    can't map the frequency to a color in my head. Can you put up a link to
    your old version?

    Why am I interested in your applet? My interest stems from our work on
    collaborative learning systems. I have a system called Flexible JAMM (Java
    Applets Made Multiuser) that allows the shared use of single-user applets,
    such as yours. Do you mind if we use the old version to test how
    difficult it will be for a developer to make an applet that can be used in
    this system?

     Flexible JAMM: http://simon.cs.vt.edu/jamm

      -Bo
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    Calistes
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    Reply #2 on: November 17, 2004, 01:23:14 pm »

    Dear sir
    This is a nice and suitable applet for the demo. Again in this applet if there is a vertical line like a screen and the indications of the points where the anti nodal and nodal lines meet this line, like in the Young's expt. i think the applet would have been more informative
    javascript:emoticon(':roll:')
    Rolling Eyes
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    murray anderson
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    Reply #3 on: July 26, 2005, 01:26:49 pm »

    Excellent applet - for use in physics classes on light and sound..............well done.
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    saurav verma
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    Reply #4 on: August 11, 2007, 11:45:39 pm »

    can u pls tell me how is intensity(maximum & minimum) related to the fringe width???
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    Fu-Kwun Hwang
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    Reply #5 on: August 12, 2007, 12:16:03 am »

    Please check out the following simulation first : single/multiple slit diffraction/interference

    It will show how the intensity changed with several parameters (slit width, slit separations... etc).
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    mikephys
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    Reply #6 on: April 17, 2009, 09:35:51 am »

    Thank you for this applet.  This is exactly the illustration I needed in conjunction with our ripple tank demonstration of two-source interference. Smiley
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    Fu-Kwun Hwang
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    Reply #7 on: July 07, 2009, 09:32:03 am » posted from:Taipei,T\'ai-pei,Taiwan

    Here is another EJS version of the same applet.

    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
    Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop. This work is licensed under a Creative Commons Attribution 2.5 Taiwan License
    • 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!
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    "That their main business was not put into the mind knowledge which was not there before, but to turn the mind's eye towards light so that it might see for itself." ...Plato's advice to educators(429-347BC)
     
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