The relation between the decay constant 'λ' and the half-life T12 of a radioactive substance is:
Correct answer: D. λ = 0.693/T1/2
- A. λ = 1/T1/2
- B. λ = 0693 T1/2
- C. λ = T1/2
- D. λ = 0.693/T1/2
Explanation
The time required for half of the original population of radioactive atoms to decay is called the half-life. The relationship between the half-life, T1/2, and the decay constant is given by T1/2 = 0.693/.
This question appeared on the UHS MDCAT 2016 paper, which you can sit online with every answer explained.
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About Half-life and Rate of Decay
Half-life is the time required for half the unstable nuclei in a sample to decay, and it remains constant for a particular radioactive nuclide. Questions use the exponential decay law, decay constant, activity, remaining quantity and mean life. Radioactive decay is random for individual nuclei but predictable for large samples.
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