shealwaysknows23
12.01.2021 •
Biology
A rock sample contains 25% of the uranium-235 it began with. What is this rock's absolute age?
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Ответ:
14.14 billion years (which is close to the age of the universe)
Explanation:half life (t1/2) U-235 = 703.8*10^6
original amountN0 at time t Nt = NO/4
t= (t1/2)*(ln(Nt/N0)/-ln2
= (703.8*10^6)*(ln0.25)/-ln2
= (703.8*10^6)*(-1.386)/-0.69
= 14.14*10^9 years
Ответ: