Let X be a radioactive element having No nuclei. The time required to decay this element to one half of its initial number No is known as:
Correct answer: C. Half life
- A. Law of radioactive decay
- B. Decay constant
- C. Half life
- D. Decay time
Explanation
Half-life is the time taken for the radioactivity of a specified isotope to fall to half its original value.
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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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