Прочитайте текст и заполните пропуски подходящими по смыслу словами Laser is an extremely simple-loo...: ответ на тест 438827 - Английский язык

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Laser is an extremely 1 _______________ device. 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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Laser is an extremely 1 _______________ device. 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 photographers 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.

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The reflection of 1_______________ waves from aircraft had been observed in England in the early 1930s and the possibility for aircraft detection was discussed in 1934. It was soon realized that radio waves would be the 2________________ alternative to the existing inadequate acoustic warning equipment, which merely listened for the sound of aircraft 3________________ and had too short a range for proper warning of approach of last aircraft. In contrast, experiments indicated that radar could give a warning when the 4_________________ was 100 miles or more away.

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Sonar (Sound Navigation and Ranging) is employed to locate submerged enemy 1________________. Like radar it is an echo-ranging 2__________________. It operates in the following way - a ship 3________________ a sound wave into the water. Encounting an obstacle the wave is reflected back to the ship, which – since the speed of sound through water is known - determines its distance from the object from the time it took the echo to return. To create the original sound wave, the ship generates 4________________ signals in а transmitter; it then sends these to a transducer, positioned on its keel as deeply in the water as possible. The transducer converts the signals into sound and transmits them through the water.