| Basic Concepts odev |
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Basic Concepts [ Kategoriye Dön ] |
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11:50 AM 10/22/08 |
| İçerik: | Basic Concepts What is an Atom? Everything in the world, and everybody in the word, is composed of different types of matter (chemical elements). The smallest part of each element is called the "Atom". An atom is so small that it can be seen only with the most powerful microscope. But the atom is the core of every substance in the universe. Are there different types of atoms? The type of atom is unique for each element, such as gold, silver, lead, tin, radium, carbon, and thorium. Our bodies are made mostly of hydrogen, carbon, oxygen, and calcium atoms. The light fixtures in this room are made of some type of metal atom. The air, as you know, is made of oxygen, hydrogen, nitrogen, and other atoms. Water is hydrogen and oxygen. What is radioactivity? Sometimes the center of an atom (its nucleus) has too much energy in it. An atom cannot hold this energy forever. Sooner or later, the atom must get rid of the excess energy and return to its normal (stable) state. Atoms with too much energy in their nuclei are called "radioactive". They get rid of their excess energy by emitting radiation. Some radioactive atoms exist naturally; others are made artificially. What is radiation? A radioactive atom gives off radiation to get rid of excess energy. The radiation can be in the form of particles moving at high speeds, or pure energy. Radiation is a broad term which includes such things as heat, light, radiowaves, microwaves and other familiar forms of energy. When radiations are emitted from an atom they are traveling at very high speeds. This means that they have a lot of "energy". When the radiations collide with something, they deposit some or all of that energy in the thing with which they have collided. You can compare the radiations from an atom with rays from the sun. When the rays from the sun reach our bodies they deposit their energy and the warmth we feel is the suns rays energy. When radiation from a radioactive atom penetrates | | Sayfa Sayısı: | 5 Sayfa |
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