What does FM stand for in FM radio?
AnswerFrequency modulation
FM encodes sound by varying the frequency of the carrier wave.
Tech · Facts & stats
Radio facts & stats
7 fact-checked facts about radio, broadcasting and radio waves, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
Who sent the first transatlantic radio signal in 1901?
AnswerGuglielmo Marconi
Marconi received a signal in Newfoundland sent from Cornwall, England.
Going deeper
What unit is used to measure radio frequency?
AnswerHertz
One hertz is one cycle per second.
Which 1938 radio drama, based on an H.G. Wells novel, became famous for alarming some listeners?
AnswerThe War of the Worlds
Orson Welles' broadcast presented a Martian invasion as news bulletins.
What does the term ham radio refer to?
AnswerAmateur radio
Ham radio is licensed, non-commercial amateur radio.
Expert level
Who first demonstrated radio waves experimentally in the late 1880s?
AnswerHeinrich Hertz
Hertz generated and detected radio waves, and the unit of frequency bears his name.
What is the approximate AM broadcast band in the Americas?
Answer530 to 1700 kHz
AM medium-wave stations use kilohertz frequencies from about 530 to 1700.
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