Use the worked example above to help you solve this problem. The half-life of the radioactive nucleus Ra is 1.6x 10³ yr. If a sample initially contains 3.34 x 1016 such nuclei, determine the following: (a) the initial activity in curies 4.5858e11 X Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. μCi (b) the number of radium nuclei remaining after 4.5 x 10³ yr 4.75e15 ✔ nuclei (c) the activity at this later time 6.527e10 X Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. μCi Use the values from PRACTICE IT to help you work this exercise. (a) Find the number of remaining radium nuclei after 3.10 x 10³ yr. N = nuclei (b) Find the activity at this time. R = μCi

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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.