Moderate
A radioactive isotope decays from 1000 Bq to 125 Bq in 12 hours. The half-life is:
Correct answer: C. 4 hours
- A. 2 hours
- B. 3 hours
- C. 4 hours
- D. 6 hours
Explanation
1000 →500→ 250 →125 3 half-life →12 hours1 half-life →12/3 hours= 4 hours.
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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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