Прочитайте текст. Atomic energy must serve peaceful purposes only. This is what Academician Igor Kur...: ответ на тест 857107 - Английский язык

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Nuclear physics
1. The study of the nucleus of an atom is known as nuclear physics. As a result of this study, scientists have discovered ways of splitting the nucleus to release huge amounts of energy. There are two types of nuclear reactions: nuclear fission and nuclear fusion. A controlled nuclear reaction inside a power station can be used to provide heat and light for our homes.
2. Nuclear power stations use fission to produce their energy. Fast-moving atomic particles called neutrons are fired at the nucleus of an atom to split it. This splitting is called fission and it causes other atoms to split in a chain reaction. Some mass (the number of heavy particles inside an atom) is lost in the process. This is converted into large amounts of nuclear energy.
3. Nuclear fusion is a type of nuclear reaction that creates huge amounts of energy. It takes place naturally inside the sun, creating the heat energy that we need to survive on Earth. At temperatures of about 14 million C dgr. the nuclei of two hydrogen atoms fuse, or join together. In the process, some mass (the number of heavy particles inside an atom) is lost and converted into energy. Scientists are trying to develop this form of nuclear reaction as a safer alternative to the nuclear fission that takes place in power stations.
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What form of producing energy is better studied by scientists?

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Nuclear physics
1. The study of the nucleus of an atom is known as nuclear physics. As a result of this study, scientists have discovered ways of splitting the nucleus to release huge amounts of energy. There are two types of nuclear reactions: nuclear fission and nuclear fusion. A controlled nuclear reaction inside a power station can be used to provide heat and light for our homes.
2. Nuclear power stations use fission to produce their energy. Fast-moving atomic particles called neutrons are fired at the nucleus of an atom to split it. This splitting is called fission and it causes other atoms to split in a chain reaction. Some mass (the number of heavy particles inside an atom) is lost in the process. This is converted into large amounts of nuclear energy.
3. Nuclear fusion is a type of nuclear reaction that creates huge amounts of energy. It takes place naturally inside the sun, creating the heat energy that we need to survive on Earth. At temperatures of about 14 million C dgr. the nuclei of two hydrogen atoms fuse, or join together. In the process, some mass (the number of heavy particles inside an atom) is lost and converted into energy. Scientists are trying to develop this form of nuclear reaction as a safer alternative to the nuclear fission that takes place in power stations.
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Yellow and brown diamonds are good only for industrial purposes and cost much cheaper than the white and blue ones. But with the coming of nuclear age, the colour of the diamonds can be changed by radiation from a nuclear reactor.
A nuclear reactor emits neutrons which give diamonds a greenish colour.
Beta rays produced by a cyclotron colour the diamonds blue. In both cases the colour changes as a result of the impact of the atomic particles on the diamonds’ structure. The radiated diamonds do not become radio-active and can be worn safely.
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What colour do neutrons give diamonds?

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Cars and airplanes can be very fast. Ships in the ocean are slower. Why is that? Mostly, it is because of the resistance of the water. Water is much more difficult to go through than air.
One idea was to design the hull (sides of a ship) to rise higher out of the water as the ship went faster. This was tried, but the ship could not go fast enough to make a smooth ride. It was finally decided that the whole ship must rise out of the water.

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About 350 years ago, Galileo Galilei (1564-1642) changed scientists’ attitudes towards Science. He developed the scientific method used to obtain theories that explain how nature works. This method, which is still in use today, includes the following steps:
– Identification of the problem.
– Formulation of a hypothesis based on collected and analysed data.
– Testing of the hypothesis to check its validity.
– Development of a theory.

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There are two main types of theories: the theories of principles and the constructive theories. The theories of principles use analysis: we observe an event and explain it through the use of mathematics and experiments. Constructive theories, on the other hand, use synthesis. In these theories we use the information from the theories of principles to construct more complex theories. For example, the theory of principles proved that matter vibrates. Later, constructive theory used this information to prove that, sound, heat and radiation derive from vibration.