Suppose the electrically charged disks at the end of the cathode-ray tube were replaced with a radioactive source, as shown in Figure P2.111. Also suppose the radioactive material inside the source emits a and B particles. The only way for either kind of particl to escape the source is through a narrow channel drilled through a block of lead. a. How many light spots do you expect to see on the phosphorescent screen? b. What are their positions relative to the electrical plates, and which particle produces which spot? Electrically charged plates Lead block Radioactive material

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Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.