9 Questions
Who transmitted the message 'What hath God wrought' using the electric telegraph in 1844?
Samuel Morse
Which scientist formulated the electromagnetic theory of light in 1864?
James Clerk Maxwell
Who confirmed the existence of radio waves experimentally in 1887?
Heinrich Hertz
Who demonstrated wireless communication over a relatively short distance of 150 yards in 1894?
Oliver Lodge
Who conducted the first radio broadcast in 1906?
Reginald Fessenden
Who invented the superheterodyne radio receiver in 1918?
Edwin H. Armstrong
What modulation scheme did Edwin H. Armstrong demonstrate in 1933?
Frequency modulation
What type of code is Morse code?
Variable-length code
Who demonstrated wireless communication over a long distance of 1700 miles in 1901?
Guglielmo Marconi
Explore the historical background of communication technologies from the invention of the telegraph by Samuel Morse to the development of radio waves by Heinrich Hertz and James Clerk Maxwell. Learn about Morse code and the electromagnetic theory of light.
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