Прочитайте текст и выберите утверждение соответствующее содержанию текста A communication system tha...: ответ на тест 223241 - Английский язык

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A communication system that does not allow an interchange between the message source and the receiver is said to be a one-way or "simplex" communication setup. One that does allow an interchange is a two-way or "duplex" setup. Noise is an important concept in communication theory. Noise is defined in communication theory as any signal that interferes with the message being sent and is an undesired disturbance in a communication system. Radio static is a form of noise. Dirt on a camera lens is noise also.

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A communication system that does not allow an interchange between the message source and the receiver is said to be a one-way or "simplex" communication setup. One that does allow an interchange is a two-way or "duplex" setup. Noise is an important concept in communication theory. Noise is defined in communication theory as any signal that interferes with the message being sent and is an undesired disturbance in a communication system. Radio static is a form of noise. Dirt on a camera lens is noise also.

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Another Russian scientist Yablochkov made a great contribution to the development of electrical science. It was Yablochkov who created the principle of a transformer. It is he who found the first practical application of the electric arc.
Thanks to Lodygin’s great discovery, an electric lamp lights up our rooms.
Popov transmitted signals by means of electromagnetic waves and gave the world his great discovery - radio.
It is Lebedev who discovered and measured the pressure of light. The photoelectric effect was among the numerous discoveries of the famous Russian scientist Stoletov.
However, it is impossible even to list here the great inventions and discoveries that our scientists made in various fields of science and engineering.

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Electricity is the power that has made possible the engineering progress of today. In fact, electricity has always been with a man, but only within the last few centuries he has learned to apply it.
One hundred years ago there were neither electric lamps, nor electric motors, nor telephone, nor radio. Now electricity is everywhere. We use electricity in our homes and in buildings where we work or study. Electric lamps light our rooms. The uses of electricity in our homes do not end with producing light. How many electric motors are working in our homes! Electric motors operate washing machines, refrigerators, vacuum cleaners, fans, clocks, and other electrical appliances.

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Radio was invented in Russia. The world’s first receiver was constructed in 1895 by the great Russian scientist Alexander Popov. There were no transmitters then, therefore his receiver could only pick up signals produced by lightning discharges during a thunderstorm. A. Popov demonstrated a device called a “storm indicator” at a meeting of the Russian Physico-Chemical Society in St. Petersburg on May 7, 1895. This day is marked now as Radio Day.

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Teletypewriters are widely used for high speed telegraph communications as well as for transmission of written messages. For economical transmission over long distances it is essential that only a single wire or transmission channel be required to carry the signal. Furthermore, the reliable and efficient operation can be secured by using not more than two conditions on the line, such as current and no current, or positive impulses and negative impulses.