$/1\mathrm{.}25$ Points.

MY NOTES

SERCP$1129\mathrm{.}3.$P$\mathrm{.}019.$

ASK YOUR IEACHER

The half$-$life of ${?}^{131}$I is $8\mathrm{.}04$ days.

$($a$)$ Convert the half$-$life to seconds.

$($b$)$ Calculate the decay constant for this isotope.

$|s^{-1}||$

$($c$)$ Convert $0\mathrm{.}380Ci$ to the SI unit the becquerel.

Bq

$($d$)$ Find the number of ${?}^{131}$ I nuclei necessary to produce a sample with an activity of $0\mathrm{.}380Ci.$

${?}^{131}$ I nuclei

$q,$ half$-$lives

$q,$ mCi

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