The half life of a radioactive element is?
Correct answer: B. 0.693/λ
- A. 0.693λ
- B. 0.693/λ
- C. λ/0.693
- D. 1/λ
Explanation
Nt = N0e-λt. N0 = initial quantity. Nt = quantity after time t . t = time period. λ = decay constant Nt = N0/2. t = t1/2. N0/2 = N0e-λt1/2. ½ = e-λt1/2. ln0.5 = -λt1/2. -0.693 = -λt1/2. t1/2 ="0.693/π".
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