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Q.

If the decay or disintegration constant of a radioactive substance is $λ$ , then its half life and mean life are respectively

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a

${λlog}_{e} 2 and \frac{1}{λ}$

b

$\frac{λ}{\log_{e} 2} and \frac{1}{λ}$

c

$\frac{1}{λ} and \frac{\log_{e} 2}{λ}$

d

$\frac{\log_{e} 2}{λ} and \frac{1}{λ}$

answer is B.

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Detailed Solution

Formula $T_{1 / 2} = \frac{\log_{e^{2}}}{λ}$ , Mean life $τ = \frac{1}{λ}$

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