When radiation interacts with matter, the depth of penetration depends on the nature of the radiation, the density of the material, and the speed of the radioactive particle when it enters the material. In general, with all other parameters being equal, a denser material will permit a shorter distance of penetration. Arrange the materials below from most to least penetration by B particles. Assume a constant distance between the source and the material. a) Plastic b) Copper c) Cotton d) Alcohol e) Lead

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Nuclear Reactions

Nuclear reactions are processes in which the fundamental characteristics of a nucleus changes. They change into a completely different nucleus. These processes occur naturally in an unstable nucleus. Bombarding an energetic particle can induce nuclear reactions.  In this article, both the naturally occurring nuclear reactions are termed as radioactive decay and the induced nuclear reactions are further categorized as nuclear fission and nuclear fusion.