[填空题]
The half-life, T, in days, of a radioactive1-f 3 38kbdtswsfkkb61b6 axy isotope can be modelled be bp(vdjadf/ :j rgw*n(*(k)uyx/7eq y the funct)fu (v/ :rx**ybdk nw /pqjjge7(e(a dion
$\frac{\ln{0.5}}{\ln{1-\frac{k}{100}}}$,0
where k is the decay rate, in percent, per day of the isotope.
1.The decay rate of Gold-196 is 6.2 % per day. Find its half-life.
T(6.2)≈ days
The half-life of Phosphorus-32 (P-32) is 14.3 days. A sample containing 120 grams of P-32 is produced and stored in a biochemistry laboratory.
2.Find the decay rate per day of P-32.
Solving the equation T(k)=14.3 for k, we obtain k= %
3.Find the amount of P-32 left in the sample after:
3.1.
14.3 days; grams
3.2.
50 days. $u_{51}$≈ grams
