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First Order Reaction

The half life...

Question

The half life of radioactive substance is $6$ years. The time taken by $12$ $g m s$ of this substance to decay completely will be

A

\infty

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B

48

years

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C

18

years

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D

72

years

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Solution

The correct option is A $\infty$
Time required to decay completely is $H a l f l i f e \times {log}_{2} (12 / 0) = 6 y e a r s \times \infty = \infty$

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