The half life of a radioactive substance is 20 minutes. In how much time, the activity of substance drops to $\frac{1}{16}^{th}$ of its initial value?

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80 minutes

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The half life of a radioactive substance is 20 minutes. In how much time, the activity of substance drops to $\frac{1}{16}^{th}$ of its initial value?

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The half life of a radioactive substance is 20 minutes. In how much time, the activity of substance drops to 116th\frac{1}{16}^{th}161​th of its initial value?

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The half life of a radioactive substance is 20 minutes. In how much time, the activity of substance drops to $\frac{1}{16}^{th}$ of its initial value?