The half-life of iodine is
Correct answer: A. 8 days
- A. 8 days
- B. 8 hours
- C. 15 days
- D. 15 hours
Explanation
The half-life of a radioactive substance is the time it takes for half of the radioactive atoms in a sample to decay. It is a fundamental property of the radioactive isotope and is used to describe the rate of radioactive decay.The mathematical expression for radioactive decay is:N(t) = N0 * e^(-λt)Where:N(t) is the number of radioactive atoms remaining at time tN0 is the initial number of radioactive atomsλ is the decay constant, which is related to the half-life (t1/2) by the equation:λ = ln(2) / t1/2Substituting the given half-life of 8 days, we get:λ = ln(2) / 8 days = 0.0866 days^-1This means that the half-life of iodine is 8 days, as indicated by the correct answer a)
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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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