The all-important concept of frequency
In the late 1800s a German physicist named Heinrich Hertz created radio waves in the laboratory. A century later, we are still expanding upon Hertz’s discovery. Radio waves make possible all wireless communications–from mobile telephone conversations to wireless data transfer. They beam our television signals, bring music to our radios, and make it safe to fly by carrying air traffic information to radar systems. And, they make contactless cards contactless.
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