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In 1903, Ernest Rutherford (a New Zealander who worked in Cambridge, England most of his life) performed a simple and elegant experiment showing that the a-particle is the nucleus of the helium atom. Rutherford positioned one glass tube inside a second glass tube. The inner tube contained a radioactive source that emitted a-particles. The outer tube contained a vacuum and at each end there was an electrode. The a-particles passed through a thin window, picking up ...
In recent years our environment has been dealt with on a very serious level. Today's generation has demanded that something be done to preserve our environment. They are speaking out and asking countless questions. In many ways the environment has been damaged beyond repair. The focus today is on repairing and preserving what remains. The physical aspects of air pollution and its effects on society is the theme of this unit. A teacher would be free to approach ...