Прочитайте текст и заполните пропуски подходящими по смыслу словами Laser beams 1_____________ it po...: ответ на тест 606845 - Английский язык

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Laser beams 1_____________ it possible not only to transmit light 2______________ over great distances, but also to encase it in very thin glass filaments - waveguides. It is possible to transmit simultaneously thousand telephone 3______________ and many 4______________ programmes over a single guide a tenth of a millimetre thick.

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Laser beams 1_____________ it possible not only to transmit light 2______________ over great distances, but also to encase it in very thin glass filaments - waveguides. It is possible to transmit simultaneously thousand telephone 3______________ and many 4______________ programmes over a single guide a tenth of a millimetre thick.

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Thermionic emission is the most 1_______________and one most commonly used in electron tubes. In this method 2________________ is heated, resulting in increased thermal or kinetic energy of the unbound electrons. Thus, a greater number of electrons will attain sufficient speed and energy 3________________  from the surface of the emitter. The number of electrons released per unit area of an emitting surface is related to the absolute temperature
of the cathode and a quantity of the work 4_______________must perform when escaping from the emitting surface.

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When high-speed 1__________________ suddenly strike a metallic 2_______________ they give up their kinetic 3_________________ to the electrons and atoms which they strike. Some of the bombarding electrons collide directly with free electrons on the metal surface and may knock them out from the surface. The electrons 4_________________ in this way are known as secondary emission electrons, since the primary electrons from some other source must be available to bombard the secondary electron-emitting surface.

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We are finally ready to apply the knowledge we gained in previous sections about electrons, vacuum 1_________________ and transistors to some practical matters. In the following sections we shall consider a variety of circuits employing electron tubes and transistors. 2_________________ are combinations of tubes or transistors with other components, such as resistors, capacitors and inductors, and form the 3________________ building blocks of electronic systems: radio, automatic computer and so on. To understand the systems, you must be familiar with the circuits that 4_______________ them up.

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Now we shall discuss amplifier circuits, or more specifically, audio amplifiers. 1 _________ is an electron tube or transistor circuit, which 2_________________ up an ac signal applied to its input. It is called a voltage amplifier if the magnitude of the output  3  __________ . From the amplifier is considerably greater than that of the input voltage. As a matter of fact the ratio of the output voltage to the 4__________________ voltage is called the amplification or gain of the amplifier.