Among the following, select the correct statement:
Correct answer: D. All of the above.
- A. The rate of disintegration is directly proportional to the number of atoms present in the sample at that instant.
- B. Equal fractions disintegrate in equal intervals of time.
- C. A radioactive sample takes an infinite time to disintegrate completely.
- D. All of the above.
Explanation
All three statements are fundamental principles of radioactive decay. The rate is proportional to the number of nuclei (A), which leads to the concept of half-life where equal fractions decay in equal times (B),and this exponential decay means it takes infinite time to reach zero (C).
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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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