Physics:The X Rays
In 1895， the German physical scientist Roentgen found a kind of rays by accident. It was a new and previously unknown radiation. He named it X rays. The X rays has a wide range of uses applied by many areas. It can be used for medical and customs examinations， and also for art issues.
- Added：2006
- Country：Germany
- Duration：15
- Time of update：2011/8/15 16:48:40