Презентация, доклад по английскому языку на тему Радио (7 класс)

radio-waves freely extended in space are used.

demanded characteristics (frequency and amplitude of a signal) is formed. Further the transmitted signal modulates more high-frequency fluctuation (bearing). The received modulated signal is radiated by the aerial in space. On the reception party of a radio-wave direct the modulated signal in the aerial then it is demodulated it (is detected) and filtered . Thus, there is an extraction of a useful signal. The received signal can differ a little from transferred by the transmitter.

of information interchange by means of radio-waves (radiotelegraphy) the Italian engineer Gulelmo Marconi (1895) is considered.

Russia, as the inventor of radiotelegraphy consider A.S. Popov.

is a radio receivers. Or those only at whom are the Internet (in a case about the radio Internet) People only listen to songs, but don't see clips under these songs (and stars)

of the house, in a garden, in a city, on walk, on picnic. By radio it is possible to hear novelties of songs and old hits.