Radio | Definition, History, & Facts | Britannica
Radio, sound communication by radio waves, usually through the transmission of music, news, and other types of programs from single broadcast stations to multitudes of individual listeners equipped with radio receivers. Learn more about the history of radio in this article.
Radio technology | History, Principles, Types, & Facts - Britannica
2024年12月20日 · Radio technology, transmission and detection of communication signals consisting of electromagnetic waves that travel through the air in a straight line or by reflection from the ionosphere or from a communications satellite. Learn more about the history, development, and principles of radio technology in this article.
Radio technology - Wireless, Broadcasting, Communication
2024年12月20日 · Radio technology - Wireless, Broadcasting, Communication: Early in the 19th century, Michael Faraday, an English physicist, demonstrated that an electric current can produce a local magnetic field and that the energy in this field will return to the circuit when the current is stopped or changed.
Radio - Broadcasting, Technology, Innovation | Britannica
Radio - Broadcasting, Technology, Innovation: The quarter century to about 1950 was also radio’s Golden Age in most industrial countries, where, despite wartime setbacks, radio flowered before the advent of television.
Golden Age of American radio | Definition, Shows, & Facts
Golden Age of American radio, period lasting roughly from 1930 through the 1940s, when the medium of commercial broadcast radio grew into the fabric of daily life in the United States, providing news and entertainment to a country struggling with economic depression and war.
Broadcasting | Definition, History, Types, Systems, Examples,
History Radiobroadcasting The United States. The first known radio program in the United States was broadcast by Reginald Aubrey Fessenden from his experimental station at Brant Rock, Mass., on Christmas Eve, 1906.
Radio - Broadcasting, Entertainment, History | Britannica
Radio - Broadcasting, Entertainment, History: The Golden Age of American radio as a creative medium lasted, at best, from 1930 to 1955, with the true peak period being the 1940s.
Radio - Broadcasting, Communication, Entertainment | Britannica
Early commercial radio broadcasting was more akin to a small-scale “mom-and-pop” operation than to a smooth-running corporate enterprise. Throughout commercial radio’s first decade (the 1920s), the broadcast day was often filled with anyone who was available.
National Public Radio (NPR) | History, Shows, Tiny Desk, & Facts ...
2025年1月15日 · National Public Radio (NPR) is the publicly funded radio network of the United States. Based in Washington, D.C., NPR offers a broad range of news and cultural programming to hundreds of local public radio stations.
Radio - Top 40, Popular Music, Broadcasting | Britannica
Radio - Top 40, Popular Music, Broadcasting: Untouched by World War II, American radio stations rapidly expanded in number to more than 2,000 AM outlets by the early 1950s. Most were in smaller markets gaining local radio service for the first time.