The half life period of $N^{13}$ is $10.1$ minute. Its life time is :

5.05

minute

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20.2

minute

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Infinity

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\frac{10.1}{0.6931}

minute

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Solution

The correct option is A Infinity
A radioactive element (nucleus) takes an infinite time to decay itself by $100$ %, thus we say that the life time of radioactive element is infinity.

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