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Radio communication

In radio communication systems, information is transported across space using radio waves. At the sending end, the information to be sent, in the form of a time-varying electrical signal, is applied to a radio transmitter. The information, called the modulation signal, can be an audio signal representing sound from a microphone, a video signal representing moving images from a video camera, or a digital signal representing data from a computer. In the transmitter, an electronic oscillator generates an alternating current oscillating at a radio frequency, called the carrier wave because it creates the radio waves that "carry" the information through the air. The information signal is used to modulate the carrier, altering some aspect of it, "piggybacking" the information on the carrier. The modulated carrier is amplified and applied to an antenna. The oscillating current pushes the electrons in the antenna back and forth, creating oscillating electric and magn...
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22)All-woman BSF bikers create record with Republic Day iniciación; Twitterati beam with take great pride in

India Republic Day -- To indicate Indias 69th Republic Morning a grand parade was held on Rajpath in New Delhi like every year after Primary Minister Narendra Modi compensated homage to the nations martyrs by laying a wreath at Amar Jawan Jyoti. But this time around the spectators were in for a splendid wonder when a newly-formed Border Security and safety Forces Womens Motor Cycle staff Seema Bhawani made an outstanding debut with their daredevil stunts at the parade. Led through Sub-Inspector Stanzin Noryang the actual squad performed breathtaking stunts for the audience including a salute to the President! Out of the of sixteen stunts an d acrobatics fish riding side riding faulaad prachand baalay shaktiman fluff fighting sapt rishi seema prahari bharat ke mustaid prahari sarhad ke nigheban and flag march pyramid were the highlights. With 113 women the Seema Bhawani made a phenomenal entrance on 26 350cc Suprême Enfield motorcycles. While the visitors cheered for them and even ...
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Discovery and exploitation

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Radio waves were first predicted by mathematical work done in 1867 by Scottish mathematical physicist James Clerk Maxwell. His mathematical theory, now called Maxwell's equations, predicted that a coupled electric and magnetic field could travel through space as an "electromagnetic wave". Maxwell proposed that light consisted of electromagnetic waves of very short wavelength. In 1887, German physicist Heinrich Hertz demonstrated the reality of Maxwell's electromagnetic waves by experimentally generating radio waves in his laboratory, showing that they exhibited the same wave properties as light: standing waves, refraction, diffraction, and polarization. Italian inventor Guglielmo Marconi developed the first practical radio transmitters and receivers around 1894–1895. He received the 1909 Nobel Prize in physics for his radio work. Radio communication began to be used commercially around 1900. The modern term " radio wave " replaced the original name ...
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