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2. Sulfur-35 is a radioactive isotope used in chemical and medical research. A 0.48-mg sample of sulfur-35 has an activity of 20.4
Ci. What is the decay constant of sulfur-35 (in /s)?
3. Neptunium-237 was the first isotope of a transuranium element to be discovered. The decay constant is 1.03 *10^(-14) /s. What is the half-life in years?

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