GK
INVENTIONS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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an iconoscope that turns light into electrical signals
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a vacuum tube that acts as a switch to boost the power of electrical signals
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a wireless telegraph that sends electrical signals and messages long distances
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a device that vibrates in response to sound and carries electrical signals of a human voice
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Detailed explanation-1: -His company’s Marconi radios ended the isolation of ocean travel and saved hundreds of lives, including all of the surviving passengers from the sinking Titanic. In 1909 he shared the Nobel Prize in Physics for his radio work.
Detailed explanation-2: -Wireless telegraphy or radiotelegraphy is transmission of text messages by radio waves, analogous to electrical telegraphy using cables. Before about 1910, the term wireless telegraphy was also used for other experimental technologies for transmitting telegraph signals without wires.
Detailed explanation-3: -He discovered that by connecting his transmitter and receiver to the earth (grounding them), and then increasing the height of the antenna, he could extend the range of the signal.
Detailed explanation-4: -Italian inventor Guglielmo Marconi (pictured at right) first developed the idea of a radio, or wireless telegraph, in the 1890s. His ideas took shape in 1895 when he sent a wireless Morse Code message to a source more than a kilometer away.