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How Is a Radio Wave Emitted?
Image: iStockphoto.com/TwilightShow

How Is a Radio Wave Emitted?

Suppose you went back in time a couple of centuries and blabbed about how, in your own time, you had a little box that could emit sounds made far away. Before you were dragged off to an insane asylum, you would be challenged to explain how it worked. Could you?

Have you any idea how radio transmitters and radio receivers use radio waves? Find out here.

A Science Odyssey/PBS
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French engineer Gustave Eiffel first tried to save his namesake tower from demolition by adding a wind laboratory. But it was radio research that ultimately saved the landmark. More...

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NobelPrize.org
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CyberCollege.com
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ExplainThatStuff!
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Kids have been building crystal radio sets for almost 100 years. Put in the necessary effort, and you'll have a simple AM radio you really understand. More...

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While radio waves transmit radio and TV shows, shorter waves called microwaves carry cell phone calls, and even shorter infrared and visible light waves can be used for communication, too. More...

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BBC
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Some people have reported hearing radio stations in their heads. Could braces or a metal filling serve as an antenna? More...

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The first radio transmission has now passed over 1,000 stars. With good enough radio receivers, aliens orbiting those stars could have tuned in to that transmission. More...

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This simulation lets you create different kinds of radio waves and watch them travel from a transmitter to a receiver. More...

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This old, low-def documentary does a fantastic job of explaining how radio came to be. Plus, it's fun to watch.
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By passing a test and buying some equipment, you can become an amateur, or Ham, radio operator. Hams communicate with people all over the world using special radio frequencies. More...

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Radio waves from space have revealed wonders that we would never have discovered had we relied only on our eyes. More...

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What’s the Difference Between AM and FM?

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At the heart of every radio transmission is a "carrier wave." It's how this wave is varied that determines what you hear. More...

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Arizona Science Center

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