The rate of decay of a radioactive substance:
Correct answer: B. Decreases with time
- A. Remains constant with time
- B. Decreases with time
- C. Increases with time
- D. May increase or decrease with time
Explanation
The rate of decay (activity) is directly proportional to the number of undecayed radioactive nuclei present. As nuclei decay, the number of remaining radioactive nuclei decreases, causing the rate of decay to also decrease exponentially over time.
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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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