Lesson Seven

Memorize the following words:

to make use of — использовать, применять circumference — окружность

to carry — нести, переносить technique — метод, техника

to forecast — предсказывать sound — звук

similar — подобный image — изображение, образ

wave — волна to affect влиять, воздействовать

earth — земля low (high) frequency низкая (высокая) частота

to propagate — распространяться branch — отрасль

to send (sent — sent) — посылать, присылать to deal (dealt — dealt) with -иметь дело с

wireless — радио, беспроволочный to exist — существовать

to emanate — излучать in the form of — в виде, в форме

beam — луч, пучок broadcasting — радиовещание

straight — прямой to serve — служить

circle — круг various — различный

e. g. (for example) — например etc. (and so on) — и так далее

Radio

1. Radio is a means of communication between distant points by signals carried by electromagnetic radiation. 2. This kind of communication is known as wireless and makes use of radiation. 3. The electromagnetic radiation used is called radio waves. 4. These waves were forecasted theoretically and some time later they were demonstrated practically. 5. Radio waves are similar to those of light by their physical nature but have different frequencies (or wavelengths). 6. The word «radio» means the radiation of waves by transmitting stations, the propagation of these waves through space and their reception by receiving stations. 7. A radio transmitting station and a radio receiving set are not connected by electrical wires or by other direct means. 8. When the first radio sending and receiving sets were made, they were called wireless sets. 9.Wireless transmission was called radio transmission or simply «radio» because radio stations emanate waves like beams of light in all radial directions. 10.. The word «radio» is a Latin word «radius» — a straight line coming from the centre of a circle to any point on its circumference. 11. Radio is the technique of wireless transmission of an electrical energy through space. 12. Radio uses an electrical energy to transmit sounds, images, telegraph signals at different distances. 13. A radio receiving set has parts that are affected by the passing radio waves and that can interpret the signals carried by the radio waves. 14. Radio deals with high and low frequency currents. 15. Radio is used in many branches of life, e. g. in medicine, biology, farming, metallurgy, machine-building, astronomy, etc. 16. Radio engineering uses many electrical devices. 17. The branch of engineering dealing with the application of electronic devices is called electronics. 18. Radio and electronics are connected. 18. For many years radio existed only in the form of radio telegraphy. 20. Then came radio telephony and then radio broadcasting and now television, which serves and will serve to millions of people. 21. Radio and television are the greatest miracles of our time.