Question

The probability of survival of a radioactive nucleus for one mean life is –

• A. 1/e
• B. 1–1/e
• C. $\frac{\mathcal{l}n2}{e}$
• D. 1–$\frac{\mathcal{l}n2}{e}$

Answer 1

Answer: (A)

1/e

Answer 2

P(survival) = = = e^–lt

for t = 1/l, P(survival) = 1/e