Radio
     Radion is not only a Programme,music or news option,its also a technology.Radio carry a lot of information.The information in the waves can be extracted and transformed also.You may know radios allow individual stations to be selected.Radio frequencies occupy the range from a 3 kHz to 300 GHz. A radio receiver receives its input from an antenna and converts it into a form usable for the users.Radio systems also need an antenna to convert radio waves.All world largest company uses it commercially and important uses.Its also a voice-communication system.












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