[填空题]
The half-life, T, in years, of a radi72xp 6ulu3qx g2 hyk2gopi9q 1t3sz a1qs :1id0mfgjm )active isotope can be modelled by the functi3z0sidaq1:1iq)9jt g1 fmmp son
T(k)=$\frac{ln0.5}{ln(1-\frac{k}{100})}$,0where k is the decay rate, in percent, per year of the isotope.
1.The decay rate of Hydrogen-33 is 5.5 % per year. Find its half-life.
The half-life of Uranium-232 (U-232) is 68.9 years. A sample containing 250 grams of U-232232 is obtained and stored as a side product of a nuclear fuel cycle. ≈
2Find the decay rate per year of U-232. k = %
3.Find the amount of U-232 left in the sample after:
(1)68.9 years; grams
(2)100 years. ≈ grams
