Moderate
What is the half-time of a radioactive sample (in minutes), if its mean life is 200 s?
Correct answer: D. 2.31 min
- A. 0.69 min
- B. 2 min
- C. 2.57 min
- D. 2.31 min
Explanation
If you multiply the average lifetime by the natural logarithm of 2 (the number 0.6931), you get the half-life
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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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