PBS
Pbs Learning Media: How Is a Radio Wave Emitted?
This illustrated essay from A Science Odyssey Web site explains the science behind radio waves, including the role of electrons and electromagnetic fields.
PBS
Pbs: Science Odyssey: Radio Transmission
PBS site explores radio transmission and provides a fun activity to go along with it. (Shockwave required) Click on links to discover more about the early years of radio, how radio waves are emitted, what the difference is between AM and...