A radioactive sample has 25% of its nuclei remaining after 8 days. What is the half- life?
Correct answer: B. 3 days
- A. 2 days
- B. 3 days
- C. 4 days
- D. 5 days
Explanation
% remaining 50%→ 25%→ 12.5 %for 25% remaining =2 half lifefor 20% remaining = 8 days(given)i.e. more than 2 half lifeSo, this means that the half-life is less than 8/2 = 4.
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Atomic nuclei contain protons and neutrons, with nuclear size, mass defect and binding energy describing their stability. The work covers alpha, beta and gamma decay, decay equations, half-life and decay rate, along with radiation safety and medical applications such as imaging, radiotherapy and tracers.
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