Power From the Nucleus
22.30 | 
Diposting oleh
Awal
Some large radioactive atoms can be made to behave in a different way. For example, an atom of uranium-235 splits into two separate atoms when it is struck by neutron. The splitting of an atom is called nuclear fission. Fission of a uranum-235 atom produce a krypton atom, barium atom and three neutron, as well as gamma rays. It also gives out a huge amount of heat energy.
When uranium-235 is struck by neutron, uranium split into barium and krypton and three neutron. Three neutron will be struck another uranium atom, to produce nine neutron and will be struck another uranium atom. A reaction that grows in this way called a chain reaction. This one is very fast. In only fraction of a second, enormous amounts of heat and radiation are produced.
The Atomic Bomb
The chain reaction above is the basis of the atomic bomb. In atomic bomb, the chain reaction builds up until its get out of control. Then the bomb explodes, giving out intense heat, a violent shock wave and deadly burst of radiation. The earth is scorched and burned for miles around, the air is poisoned, and the living thing are killed. The full effect of atomic bomb is not felt in a day, or even a week. The products of the explosion are radioactive, and some of them have long half-lives. They settle to the earth and slowly decay, causing radiation sickness, cancer and death.
The world's first atomic bomb was dropped on 
Hiroshima, in Japan, in August 1945. It probably contained about 10 kilograms of uranium. It killed 80 000 people within a day and 60 000 more died within a year. Nowadays, some countries possess bombs that are 5000 times more powerfull!!!
0 komentar:
Posting Komentar