[ Teens/Mature Teens ] A Java applet showing the how wave fronts cause the effect.

[ Teens/Mature Teens ] Explains a variety of concepts related to making waves in water.

[ Kids ] Learn about the different stages of radio transmission, how radio waves are emitted, and the difference between AM and FM radio.

[ Teens/Mature Teens ] A diagram of a wave, with labeled parts. Includes an interactive window in which the user can change the frequency of the wave.