The activity of a radioactive sample reduced from 20 \( \mathrm{Ci} \) to \( 1.25 \mathrm{Ci} \)....

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The activity of a radioactive sample reduced from 20 \( \mathrm{Ci} \) to \( 1.25 \mathrm{Ci} \) in 2000 years. The half life of the
\( \mathrm{P} \)
sample and its decay constant are respectively
(1) 4000 years and \( 1.1 \times 10^{-3} y^{-1} \)
(2) 500 years and \( 1.1 \times 10^{-2} \mathrm{y}^{-1} \)
(3) 500 years and \( 1386 \times 10^{-3} y^{-1} \)
(4) 1000 years and \( 1.386 \times 10^{-3} \mathrm{y}^{-1} \)


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