Вопрос № 627661 - Английский язык

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The crackle heard in radio receiver can also be produced by high-voltage power lines.

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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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The use of HF/DF was given much credit, along with microwave radar, for the eventual defeat of the very serious German submarines threat.

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Short wave can be transmitted on larger frequency than long or medium wave.

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The receivers have perfectly accurate clocks as a rule.

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Sonic and light waves can not identify objects at long ranges.