A beam of particles strikes a wall containing 2 × 1029 nuclei per m3 . Each nucleus behaves like a sphere of radius 3 × 10−15 m. Find the thickness of a wall that exactly half the particles will penetrate without scattering. What thickness would be needed to stop all but one particle in 106 ?

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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.