Прочитайте текст и заполните пропуски подходящими по смыслу словами Electronics is one of the main 1...: ответ на тест 438819 - Английский язык

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Electronics is one of the main 1_____________, which forms the 2_______________ basis for using these new methods. Electronics studies the problems connected with the application of instruments and 3_____________, the action of which is based on the utilization of various phenomena that result from the movement of 4______________ through vacuum, gases and solid bodies.

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Electronics is one of the main 1_____________, which forms the 2_______________ basis for using these new methods. Electronics studies the problems connected with the application of instruments and 3_____________, the action of which is based on the utilization of various phenomena that result from the movement of 4______________ through vacuum, gases and solid bodies.

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Intensive 1______________ of radio-location began in the early forties. All these years the vacuum tube was the heart of electronics and, hence, the field of electronics was usually 2_______________ as the study of the motion of electrons in vacuum tubes. However, it was found that small, controlled quantities of gas introduced into a "vacuum tube" could make it perform switching, 3______________ and other jobs. To include the category of gas-filled tubes, "vacuum tubes" became converted to "electron tubes" and the science of electronics was expanded to include the study of electron motion in  4______________.

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Laser is an extremely simple-looking 1 _______________. It is nothing more than a cylinder of synthetic ruby about 1/4 2 _____________ in diameter and 1 1/2 inches long mounted in the centre of a spiral coil of glass. The coil is a xenon-filled flash 3_____________ very much like the ones 4_______________ by hotographers for taking flash pictures.

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The range of the 1______________ use is expanding with 2______________ passing year. The use of picoseconds laser pulses will help to 3______________ faster and more powerful microchips information circuits and computers by mapping more exactly the routes electrons take through semiconductor materials, the rates they travel and the effects of impurities. 4______________ lasers will help research on interactions among molecules in liquids.

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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.