Decay constant 'λ' is given as:
Correct answer: A. λ = ln(2)/T1/2
- A. λ = ln(2)/T1/2
- B. λ = N/t
- C. λ = dN/dt
- D. λ = A/N
Explanation
The decay constant (λ) is a measure of the probability of decay of a single atom over a unit of time, often expressed as λ = ln(2)/T1/2, where T1/2 is the half-life of the material. This indicates how quickly a substance will decay. Option A provides this correct relationship. Options B, C, and D incorrectly relate the decay constant with other aspects of decay, such as the number of atoms, change in number, or activity, which do not directly define the decay constant itself.
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