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The half life of a radioactive substance is 20 minutes. In how much time, the activity of substance drops to \({\left(\f…

Q1

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

a

40 minutes

b

60 minutes

c

80 minutes

d

20 minutes

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