Вопрос № 56055 - Английский язык

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The laser beam is 1_____________ by exciting the atoms of a suitable material - ruby is one - until most of the atoms have electrons orbiting in a higher energy level than usual. The excitation is then stopped and all the excited electrons fall back together, to their 2______________ orbits, each one emitting a pulse of light of the same energy. In this way an intense beam of light is generated for a very short time. And every pulse or wave-train in this beam is in step with every other3______________  . In this way a beam of light is obtained which is both monochromatic and coherent and easy to focus. This light is reflected by the mirror at one end of the tube. It can only escape at the other 4______________ of the tube.

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The laser beam is 1_____________ by exciting the atoms of a suitable material - ruby is one - until most of the atoms have electrons orbiting in a higher energy level than usual. The excitation is then stopped and all the excited electrons fall back together, to their normal orbits, each one emitting a pulse of 2______________ of the same energy. In this way an intense beam of light is generated for a very short time. And 3______________ pulse or wave-train in this beam is in step with every other pulse. In this way a beam of light is obtained which is both monochromatic and coherent and easy to focus. This light is reflected by the mirror at one end of the tube. It can only escape at the other 4______________ of the tube.

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The person who handles applications for vacant posts is _____.

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The _____ is all living matter on the planet or the portion of the planet occupied by life.

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Landmark Inventions of the Millennium
1. The last 1,000 years have produced an incredible number and variety of scientific and technological breakthroughs – but which of these were the most important? Narrowing a list of the thousands of inventions made since the year 1000 to the ten greatest requires some exact criteria. The qualifying inventions either provided radically new ways to do an important job, or they made possible tasks that were previously unimagined. Their impact was felt, if not right away then eventually, by a large portion of humanity. These developments have made possible significant new technological innovations and scientific discoveries. And finally, they have had an enduring effect on the world.
2. The inventions that meet these criteria, in chronological order, are the compass, the mechanical clock, the glass lens, the printing press, the steam engine, the telegraph, electric power, wireless communications, antibiotics, and the transistor. Missing from this list are many extremely significant technological advances, including the airplane, telephone, automobile, and computer. In many cases these inventions were omitted because they are based on earlier developments or breakthroughs.
3. In considering the ten most significant inventions of the past 1,000 years, a subtle distinction must be made: the difference between «invention» and «discovery» is not as clear as one might think. A discovery can be as simple as the observation of a previously unnoticed phenomenon, while an invention is a human-devised machine, tool, or apparatus that did not previously exist.
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The collective decision-making body of Her Majesty's Government in the United Kingdom, composed of the Prime Minister and some 22 Cabinet Ministers is called …