What is Radioactivity in Physics
What is Radioactivity in Physics
The phenomenon of emission of radiation from Uranium and other substances is known A as radioactivity. The substances that emit radiation are known as radioactive elements.
Experiment:
A small quantity of a radioactive element such as radium is placed in a cavity of a lead block in such a way that the radiation from radium can only come out through this cavity. A photographic plate is placed at some distance above the lead black so that the radiation from radium falls upon it. The apparatus is placed in a vacuum light chamber which is evacuated by a powerful pump. This chamber is then placed between the poles of a powerful magnetic field. Under the action of magnetic field, two or three types of radiation are deflected forming three separate images on the photographic plate.
The first e-books appeared in 1998.Since that time, their assortment and price range has grown so much that almost anyone can afford this purchase. Currently, there are three price categories in which you can choose an e-book for yourself. The first is e-books worth up to five thousand rubles. They do not have outstanding performance. They usually have a TFT screen of no more than five inches. In the next price category, books costing up to ten thousand rubles. Their screen is already made using e-ink technology.
