History of Radio

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Completar Frases History of RadioVersión en línea Fill in the gaps with the correct word. por Soraya Music 1 waves radio wireless code exchange physicist signal built travel commercial communication enabled speed broadcast Electromagnetic were predicted by James Clerk Maxwell in his 1873 theory of electromagnetism , now called Maxwell's equations , who proposed that a coupled oscillating electric field and magnetic field could through space as a wave , and proposed that light consisted of electromagnetic waves of short wavelength . On November 11 , 1886 , German Heinrich Hertz , attempting to confirm Maxwell's theory , first observed radio waves he generated using a primitive spark gap transmitter . Experiments by Hertz and physicists Jagadish Chandra Bose , Oliver Lodge , Lord Rayleigh , and Augusto Righi , among others , showed that waves like light demonstrated reflection , refraction , diffraction , polarization , standing waves , and traveled at the same as light , confirming that both light and radio waves were electromagnetic waves , differing only in frequency . In 1895 , Guglielmo Marconi developed the first radio system , using a spark gap transmitter to send Morse over long distances . By December 1901 , he had transmitted across the Atlantic ocean . Karl Ferdinand Braun invented the phased array antenna in 1905 . Three antennas are arranged to transmit a directional . Marconi and Braun shared the 1909 Nobel Prize in Physics " for their contributions to the development of telegraphy " . During radio's first two decades , called the radiotelegraphy era , the primitive damped wave radio transmitters could only transmit pulses of radio waves , not the continuous waves which were needed for audio modulation , so radio was used for person - to - person , diplomatic and military text messaging . Starting around 1908 industrial countries worldwide networks of powerful transoceanic spark transmitters to telegram traffic between continents and communicate with their colonies and naval fleets . During World War I the development of continuous wave radio transmitters and rectifying electrolytic and crystal radio receiver detectors amplitude modulation ( AM ) radiotelephony to be achieved by Reginald Fessenden and others , allowing sound ( audio ) to be transmitted . On November 2 , 1920 , the first commercial radio was transmitted by Westinghouse Electric and Manufacturing Company in Pittsburgh , under the call sign KDKA featuring live coverage of the Harding - Cox presidential election .

Completar Frases

History of RadioVersión en línea

Fill in the gaps with the correct word.

waves radio wireless code exchange physicist signal built travel commercial communication enabled speed broadcast

Electromagnetic were predicted by James Clerk Maxwell in his 1873 theory of electromagnetism , now called Maxwell's equations , who proposed that a coupled oscillating electric field and magnetic field could through space as a wave , and proposed that light consisted of electromagnetic waves of short wavelength .

On November 11 , 1886 , German Heinrich Hertz , attempting to confirm Maxwell's theory , first observed radio waves he generated using a primitive spark gap transmitter . Experiments by Hertz and physicists Jagadish Chandra Bose , Oliver Lodge , Lord Rayleigh , and Augusto Righi , among others , showed that waves like light demonstrated reflection , refraction , diffraction , polarization , standing waves , and traveled at the same as light , confirming that both light and radio waves were electromagnetic waves , differing only in frequency .

In 1895 , Guglielmo Marconi developed the first radio system , using a spark gap transmitter to send Morse over long distances . By December 1901 , he had transmitted across the Atlantic ocean .

Karl Ferdinand Braun invented the phased array antenna in 1905 . Three antennas are arranged to transmit a directional .

Marconi and Braun shared the 1909 Nobel Prize in Physics " for their contributions to the development of telegraphy " .

During radio's first two decades , called the radiotelegraphy era , the primitive damped wave radio transmitters could only transmit pulses of radio waves , not the continuous waves which were needed for audio modulation , so radio was used for person - to - person , diplomatic and military text messaging .

Starting around 1908 industrial countries worldwide networks of powerful transoceanic spark transmitters to telegram traffic between continents and communicate with their colonies and naval fleets .

During World War I the development of continuous wave radio transmitters and rectifying electrolytic and crystal radio receiver detectors amplitude modulation ( AM ) radiotelephony to be achieved by Reginald Fessenden and others , allowing sound ( audio ) to be transmitted .

On November 2 , 1920 , the first commercial radio was transmitted by Westinghouse Electric and Manufacturing Company in Pittsburgh , under the call sign KDKA featuring live coverage of the Harding - Cox presidential election .

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History of Radio

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History of RadioVersión en línea

por Soraya Music

waves radio wireless code exchange physicist signal built travel commercial communication enabled speed broadcast

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