Вопрос № 223112 - Английский язык

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Electronic computers are widely used in 1_______________ research аnd industrial designing. Huge radio-telescopes, 2_____________ with sensitive instruments and 3_______________ amplifiers enable man to gain an insight into the remotest corners of space, 4_________________ new and puzzling phenomena of nature.

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Electronic computers are widely used in 1_______________ research аnd industrial designing. Huge radio-telescopes, 2_____________ with sensitive instruments and powerful
amplifiers enable man 3_______________ an insight into the remotest corners of space, discover 4_________________ and puzzling phenomena of nature.

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Lasers are used in 1________________ and in agriculture. Russian scientists have developed a 2______________ instrument - the laser projection 3_______________ (the work received the USSR State Prize). The tremendous brightness of laser radiation 4________________ it possible to project clear images of microobjects onto large screens, magnified 15,000 times.

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

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When 1__________________ electrons 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 4_________________ on the metal surface and may knock them out from the surface. The electrons freed 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.