The activity of a radioactive sample (with a single radioactive nuclide) decreases to one eighth its initial

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The activity of a radioactive sample (with a single radioactive nuclide) decreases to one eighth its initial value in a time interval of 96 days. What is the half-life of the radioactive nuclide present?

(a) 6 days
(b) 8 days
(c) 12 days
(d) 16 days
(e) 24 days
(f) 32 days

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