Прочитайте текст. Radioactive substances are composed of unstable atoms that break down and release ...: ответ на тест 1104841 - Английский язык

Прочитайте текст.
Radioactive substances are composed of unstable atoms that break down and release high-level energy called radiation. These atoms eventually form new elements. There are three types of radiation, known as alpha rays, beta rays, and gamma rays. Alpha rays consist of four atomic particles: two protons and two neutrons. They are the weakest type of radiation and have a positive electrical charge. Beta rays are more powerful and are composed of atomic particles called electrons, which have a negative charge. Gamma rays are the most powerful and a pure form of energy with no mass and no charge.
Закончите предложение:
Alpha rays consist of …

Прочитайте текст и выполните задания.
Microwaves
1. Microwaves are a form of radiant energy. Other common forms are radio waves, visible light, infrared heat and electricity. All forms of radiant energy are a part of the electromagnetic spectrum. To distinguish between the forms, they are classified according to the wave length which may vary from miles to thousandths of an inch.
2. Microwaves are located in the non-ionizing portion of the energy spectrum between radio waves and visible light. The first application of microwaves was in radar during World War II. Today microwaves are widely used in communication systems, radar and many other commercial and industrial applications.
3. Significantly large segments of the population are exposed to infrared rays, visible light waves and microwaves every day. One characteristic of microwaves is their ability to bounce or deflect off metal surfaces, a characteristic basic to its use in radar. Another is its thermal or heating effect utilized in microwave cooking.
4. The difference between microwave energy and other forms of ionizing radiation, such as X-rays, Alpha, Beta and Gamma rays, is that microwave energy is non-ionizing. In other words, it does not alter the molecular structure of the item being heated. The effects of microwave energy are strictly thermal and do not cause cellular change as with ionizing radiation.
Завершите утверждение согласно содержанию текста.
Like X-rays, Alpha, Beta and Gamma rays microwaves …

Прочитайте текст.
The French chemist Antoine Lavoisier is regarded as the father of modern chemistry. He is remembered particularly for his work on gases, gunpowder, and combustion. He discovered and named both oxygen and hydrogen, observing that these two gases combine to produce water. This led him to describe elements and compounds, giving many the names by which they are known today. Lavoisier and his wife Marie were meticulous scientists who produced some important manuals describing scientific experiments. In the aftermatch of the French Revolution, Lavoisier was executed by revolutionaries.
Закончите предложение:
The French chemist Antoine Lavoisier discovered and named …

Прочитайте текст.
The American inventor Thomas Edison lived and worked in the United States all his life. He was the most productive inventor ever. During his lifetime, he patented 1,093 different inventions, including the incandescent electric lamp, the motion-picture projector, and the phonograph. He also set up the first industrial research laboratory. Edison had a slow start in life. He was expelled from school because people did not realize that he was deaf, thinking instead that he was unable to learn. His mother taught him at home, where he had built his own laboratory by the time he was 10 years old.
Закончите предложение:
Thomas Edison was expelled from school because people did not realize that he was …

Прочитайте текст.
Any measurements – for example, of temperature, distance, time or weight – are based on units. A unit is a fixed quantity. In ancient times, body parts were used to measure length. The Greeks used the finger as a basic unit of length, with 16 fingers equaling one foot. Measurement of weight was originally based on how much a man could lift. These imprecise measurements developed into a system of common units.
Закончите предложение:
In ancient times, body parts were used to measure …

Прочитайте текст.
In the 4-th century BC in Greece, there were only a few schools, and none taught science. It was left to philosophers to come up with logical explanations of the world. Aristotle studied under the famous philosopher Plato, who regarded thought or the idea as the basis of all knowledge. Aristotle later decided that theories about the world must be based on the close study and classification of nature. Aristotle catalogued the known species of animals and plants, believing they were made of four elements: earth, water, fire, and air. He also believed that a fifth element, ether, surrounded the Earth.
Закончите предложение:
Aristotle studied under the famous philosopher Plato, who regarded thought or the idea as the basis of …