Florida State University
Florida State University: Molecular Expressions: Electromagnetic Radiation
This Florida State University page introduces light as an electromagnetic wave and discusses the frequency and wavelength range of the various regions of the electromagnetic spectrum. Includes links to some interactive Java applets.
Florida State University
Florida State University: Powers of Ten
This webpage from the Florida State University offers an applet with succeeding images, each "10 times bigger or smaller than the one preceding or following it," as a demonstration of exponential notation.