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Who developed the theory of electromagnetic waves? What is another name for that theory? 开始学习
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Maxwell developed the theory of electromagnetic waves. Another name for it is Maxwell's Equations or Classical Electromagnetism.
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Whose ideas did Maxwell incorporate into his unified theory of electromagnetism? 开始学习
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He incorporated the previous work of scientists like Michael Faraday (fields and lines of force), André-Marie Ampère (electrodynamics), and Carl Friedrich Gauss (electrostatics).
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Who verified Maxwell’s ideas experimentally? 开始学习
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Hertz verified Maxwell's ideas experimentally in the late 1880s.
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What is a coherer? Who invented it? 开始学习
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A coherer was an early radio wave detector consisting of a glass tube filled with metal filings. Its resistance decreased when exposed to radio waves. It was invented by Édouard Branly, and later improved by Oliver Lodge.
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What did Tesla demonstrate in 1892? 开始学习
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Tesla demonstrated a wireless radio-controlled boat.
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Could the first radio transmit voice? 开始学习
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No, the first radio systems transmitted signals using Morse code, not voice.
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What did Popov demonstrate in 1895? 开始学习
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Popov demonstrated a lightning detector, which was effectively the first radio receiver.
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What can you say about Fessenden’s contribution to radio broadcast development? 开始学习
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Fessenden made the first long-distance transmission of voice and music in 1906, which was a fundamental breakthrough for audio broadcasting.
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What did Marconi patent in 1896? 开始学习
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Marconi patented a system for wireless telegraphy (radio communication).
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When and where did Marconi establish the first radio station? 开始学习
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He established the first wireless telegraphy station in 1897 on the Isle of Wight, England.
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How did Popov use the first radio receiver that he built in 1894? 开始学习
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He used it to detect and record lightning strikes and atmospheric electricity.
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How could Hertz transmit and receive electromagnetic waves in 1886? 开始学习
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He used a spark-gap transmitter (a dipole antenna with a spark gap) to generate waves and a simple loop of wire with a small gap (a resonator) to detect them.
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