Guglielmo Marconi was an Italian inventor known for developing radiotelegraphy, the foundation for wireless communication companies worldwide. He shared the 1909 Nobel Prize in Physics with Karl Ferdinand Braun for their contributions to developing wireless telegraphy. Marconi became interested in science and electricity at a young age and was inspired by Heinrich Hertz's experiments demonstrating radio waves in the late 1880s.

2. Guglielmo Marconi (25 April 1874 – 20 July 1937) was an Italian inventor, best known for his development of a radiotelegraph system, which served as the foundation for the establishment of numerous affiliated companies worldwide. He shared the 1909 Nobel Prize in Physics with Karl Ferdinand Braun, "in recognition of their contributions to the development of wireless telegraphy". Marconi

3. The Radio Invention During his early years, Marconi had an interest in science and electricity. One of the scientific developments during this era came from Heinrich Hertz, who, beginning in 1888, demonstrated that one could produce and detect electromagnetic radiation—now generally known as "radio waves", at the time more commonly called "Hertzian waves" or "aetheric waves". Hertz's death in 1894 brought published reviews of his earlier discoveries, and a renewed interest on the part of Marconi. He was permitted to briefly study the subject under Augusto Righi, a University of Bologna physicist and neighbor of Marconi who had done research on Hertz's work.

4. The meaning of Radio The meaning and usage of the word "radio" has developed in parallel with developments within the field and can be seen to have three distinct phases: electromagnetic waves and experimentation; wireless communication and technical development; and radio broadcasting and commercialization. Many individuals - inventors, engineers, developers, businessmen - contributed to produce the modern idea of radio and thus the origins and 'invention' are multiple and controversial. Early radio could not transmit sound or speech and was called the "wireless telegraph". http://en.wikipedia.org/wiki/Radio#History

5. FM broadcasting is a broadcast technology invented by Edwin Howard Armstrong that uses frequency modulation (FM) to provide high-fidelity sound over broadcast radio The term ‘FM band’ is effectively shorthand for ‘frequency band in which FM is used for broadcasting’. It can upset purists, because it conflates a modulation scheme with a range of frequencies. In most of the world, the FM broadcast band, used for broadcasting FM radio stations, goes from 87.5 to 108.0 MHz's. In Japan the FM broadcast band is 76–90 MHz, unlike any other country in the world. http://en.wikipedia.org/wiki/FM_broadcast_band FM Broadcasting

6. Radio Programs We can listen in the radio programs about: Weather Forecast Traffic Information Music Entertainment News Sports Games Debates Interviews Running commentaries

7. Radio is a greater potential in mass communication than the other mass media for two reasons. Firstly, it reaches even the remote corners of the country and has no physical impediments. Secondly, it imparts language education and provides entertainment and disseminates information to both literate and illiterate listeners. Radio is under government control for fear of its misuse and powerful influence. http://www.languageinindia.com/april2003/massmedia.html Radio - Mass Media

8. Advantages of Radio Radio is a universal medium enjoyed by people at one time or another during the day, at home, at work, and even in the car. Is the least expensive of all means of communication Gives your business personality through the creation of campaigns using sounds and voices Free creative help is often available Rates can generally be negotiated During the past ten years, radio rates have seen less inflation than those for other media http://www.powerhomebiz.com/vol118/admediums.htm

9. Disadvantages of Radio Because radio listeners are spread over many stations, you may have to advertise simultaneously on several stations to reach your target audience Listeners cannot go back to your ads to go over important points Ads are an interruption in the entertainment. Because of this, a radio ad may require multiple exposure to break through the listener's "tune-out" factor and ensure message retention Radio is a background medium. Most listeners are doing something else while listening, which means that your ad has to work hard to get their attention http://www.powerhomebiz.com/vol118/admediums.htm

10. Some old pictures about the history of the Radio

14. “ Over and Out” Thanks