The ratio of the rate of decay of a parent atom to the number of radioactive nuclei present at that time is equal to:
Correct answer: C. Decay constant of radioactive element
- A. Half-life of radioactive element
- B. Mean life
- C. Decay constant of radioactive element
- D. Activity of radioactive element
Explanation
Rate of decay ÷ number of nuclei = λ, which is the decay constant. It represents the probability per unit time that a nucleus will decay.
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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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