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PhET Interactive Simulations

Use the links below to run the simulation within your browser or to download the Java applet of the simulation. Note that Java applets will not run on Chromebooks.


You may need to change the security settings in the Java console to run these applets.

  • Click in the search box of the computer taskbar and type "java".
  • When the search results appear, click on the "Java console" icon.
  • Select the "security" tab from the console window.
  • Change the security setting from "high" to "medium."
  • Click "apply."

When you attempt to run a Java applet, you will be given a choice to override the security settings to run an applet made with an old version of Java. Select that option to proceed.


Molecule Polarity (Java)

Molecule Shapes (HTML)

Radioactive Dating Game

Nuclear Fission

Rutherford Scattering (Java)

Build an Atom (HTML 5)

Alpha Decay (Java)

Beta Decay (Java)

Isotopes and Atomic Mass (Java)

Models of the Hydrogen Atom (Java)

Photoelectric Effect (Java)