Problem

1. a Explain the meaning of the following terms: - i *half-life*,

t_{\frac{1}{2}}

- ii *activity* 2. b In what SI units is the activity usually measured? 3. c Radioactive materials sold for educational purposes often have their activities given in Curies, Ci, or microcuries,

\mu\text{Ci}

. How do 1 Ci and 1

\mu\text{Ci}

compare to the modern SI unit for activity? a. a Explain the meaning of the following terms: - i *half-life*,

t_{\frac{1}{2}}

- ii *activity*

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