The half-life T1/2, of a radioactive element, is that period in which _ of the atoms decay.
Correct answer: C. Half
- A. Nine times
- B. Double
- C. Half
- D. Four times
- E. Seven times
Explanation
The correct option is C (Half) because the half-life represents the period in which half of the radioactive atoms in a sample decay. For example, if you start with 100 atoms, after one half-life, there will be 50 atoms remaining.
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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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