The decay constant of radioactive sample is λ. The half-life and mean-life of the sample are, respectively, given by

1/λ and (ln2)/λ

(ln2)/λ and 1/λ

λ/(ln2) and 1/λ

λ(ln2) and 1/λ

A

λ(ln2) and 1/λ

B

(ln2)/λ and 1/λ

C

λ/(ln2) and 1/λ

D

1/λ and (ln2)/λ

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Solution

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We know that, N=N0e−λt eλt=N0N⇒λt=ln(N0N)

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