Вопрос № 1072206 - Английский язык

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Electromagnetism
1. Electricity and magnetism combine to form one of the fundamental forces of the universe – electromagnetism. The two constantly interact, and the relationship between them is one of the most important in physics. For example, an electric current passing through a wire creates a magnetic field; and if the lines of force around a magnet are cut by a passing object, an electric current will be produced.
2. Magnets are attracted to iron and to any material that contains iron. Magnets have two poles, a north pole and a south pole. Unmagnetized iron and steel have magnetic regions of atoms called domains that are jumbled up and point in lots of different directions. When iron or steel becomes magnetized, the domains become aligned and they all point in the same direction. One end of each domain points toward the magnetic north pole.
3. Electronics is a new branch of physics, and one that plays an increasingly important part in our lives. It is concerned with the use of electricity to produce signals that carry information and control devices such as computers. These devices contain electric circuits through which electric current flows. The controlling parts in a circuit are called components, and these include diodes and transistors. Components can amplify currents, switch them on and off, or change their direction.
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Electromagnetism
1. Electricity and magnetism combine to form one of the fundamental forces of the universe – electromagnetism. The two constantly interact, and the relationship between them is one of the most important in physics. For example, an electric current passing through a wire creates a magnetic field; and if the lines of force around a magnet are cut by a passing object, an electric current will be produced.
2. Magnets are attracted to iron and to any material that contains iron. Magnets have two poles, a north pole and a south pole. Unmagnetized iron and steel have magnetic regions of atoms called domains that are jumbled up and point in lots of different directions. When iron or steel becomes magnetized, the domains become aligned and they all point in the same direction. One end of each domain points toward the magnetic north pole.
3. Electronics is a new branch of physics, and one that plays an increasingly important part in our lives. It is concerned with the use of electricity to produce signals that carry information and control devices such as computers. These devices contain electric circuits through which electric current flows. The controlling parts in a circuit are called components, and these include diodes and transistors. Components can amplify currents, switch them on and off, or change their direction.
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The form of energy that illuminates our world is called 1_______. It usually comes from hot objects, like the sun or fire, but it is also produced by electricity and some 2_______ reactions. Light is the only part of the electromagnetic spectrum that is visible to the human eye. It travels at 186,000 miles (300,000 km) per second, and nothing can 3_______ faster. Like other forms of energy, light travels in 4_______, but it can also travel in packets of energy called quanta.

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The English physicist and mathematician Isaac Newton was one of the 1_______ scientists of all time. His theories revolutionized scientific thinking and laid the foundations of modern 2_______. His book «Principia Mathematics» is one of the most important works in the history of modern science. Newton 3_______ the law of gravity, and developed the three laws of motion that are still in use today. He was the first person to split white light into the 4_______ of the spectrum.

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The name of German physicist Heinrich Hertz has become a part of everyday language because of his work on electromagnetic 1_______. The hertz (Hz), the unit used to measure the frequency of electromagnetic waves, is named for the German 2_______. Hertz was inspired by the work of the 3_______ physicist James Clerk Maxwell, who had predicted the existence of electromagnetic waves. Hertz designed and 4_______ equipment that proved that these waves exist and that they could be detected at a distance.

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The Universe contains everything that exists – not only the 1_______ and everything on it, but also all the planets, stars, and galaxies, and the space in between them. The sun, at the center of the solar system, is just one of about 100 billion stars in our galaxy, or collection of stars, called the Milky Way. 2_______ have estimated that there are about 100 billion other galaxies in the universe. Most scientists 3_______that the universe formed about 15 billion years ago in an enormous explosion called the big bang. They also think that 4_______ is expanding.