https://padlet.com/powatt/q67do2povmhw en-us 2017-03-15 13:51:48 UTC 2025-10-11 15:30:51 UTC hello@padlet.com powatt https://padlet.com/powatt/q67do2povmhw/wish/160249761 The invention of the radio is a collective work which leaves the discovery of electromagnetic waves, of invention of telegraph and leads to the first wireless  usable materials. In 1894, Guglielmo Marconi uses several inventions and discoveries to accomplish the first installation of radio. In 1901, the radio becomes an inevitable tool of the army.]]> 2017-03-15 13:55:59 UTC https://padlet.com/powatt/q67do2povmhw/wish/160249761 powatt https://padlet.com/powatt/q67do2povmhw/wish/160921076 New technologies (cellphones, computer, radio...) are an example of the first wireless usable technologies. But the electromagnetic waves issued by new technologies (cellphones, computer, radio...) are dangerous for everybody but especially for children. There are many adverse effects as the loss of memory or disturbances of attention. Therefore, even if new technologies allow mass communication to be more rapid, they also have adverse effects on the persons who use them.]]> 2017-03-18 10:32:12 UTC https://padlet.com/powatt/q67do2povmhw/wish/160921076 powatt https://padlet.com/powatt/q67do2povmhw/wish/160921222 The telegraph is a system intended to transmit messages (télégrammes) from a point to other one on big distance. There are différents types of telegraphs : telegraph air, electrical telegraph and wireless telegraph. The telegraph is one of inventions that allowed, before the radio, to bring some change in the mass communication so that it becomes a little more rapid.]]> 2017-03-18 10:34:40 UTC https://padlet.com/powatt/q67do2povmhw/wish/160921222 powatt https://padlet.com/powatt/q67do2povmhw/wish/160921800 Guglielmo Marconi is a physicist , an inventor and an Italian businessman. He was considered for a long time to be the inventor of the radio. He is the founder of the first international company of broadcasting.]]> 2017-03-18 10:43:29 UTC https://padlet.com/powatt/q67do2povmhw/wish/160921800 powatt https://padlet.com/powatt/q67do2povmhw/wish/160925705 We can use the radio as communication means, as means of entertainment or else as means to explore space while with the printed word, we can do fewer things. For example, we can announce but it's puts much more time. In the future, there will be new available frequencies of radio. We will be able even to know the weather forecast, listen to matches of sports, listen to music and to advertise. For communication, the radio differs from the printed word because information can be transmitted faster.]]> 2017-03-18 11:56:11 UTC https://padlet.com/powatt/q67do2povmhw/wish/160925705 powatt https://padlet.com/powatt/q67do2povmhw/wish/160926662 The exploration of space consists of the physical exploration of space, that is to say of all external objects in the Earth. There are three major events of space exploration : the first orbital space flight of History in 1957, the first manned flight by a human being in 1961 and the first step on the Moon in 1969. Here the radio allows to retranscribe everything in the world.]]> 2017-03-18 12:15:34 UTC https://padlet.com/powatt/q67do2povmhw/wish/160926662 powatt https://padlet.com/powatt/q67do2povmhw/wish/160927444 The new frequencies of the radio :
- to know the weather forecast
- to listen to sport
- to listen to music
- to advertise]]> 2017-03-18 12:30:31 UTC https://padlet.com/powatt/q67do2povmhw/wish/160927444 powatt https://padlet.com/powatt/q67do2povmhw/wish/160927565 Odar Julie TS3]]> 2017-03-18 12:33:31 UTC https://padlet.com/powatt/q67do2povmhw/wish/160927565