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Half life

The half life...

Question

The half life of a radio active element is $10$ hours. Its average life is:

A

0.144 h o u r

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B

14.4 h o u r

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C

14.4 h o u r^{- 1}

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D

14.4 s e c

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Solution

The correct option is A $14.4 h o u r$
$t_{1 / 2} = 10 h r$

$t_{a v g} =$ $\frac{1}{λ} = \frac{10}{.693}$ $= 14.43 h r$

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