Biology, 05.10.2019 18:30 mahogany1956
Apotassium isotope has a half-life of 1.25 billion years. given that scientists estimate earth's age to be 4.6 billion years, what is the most likely percentage of parent to daughter isotopes of this element currently existing on earth?
a. less than 10 percent
b. 25 percent
c. 50 percent
d. more than 75 percent
Answers: 1
![t = [\frac{ln\frac{N}{N_{0} } }{-0.693} ]* t_{\frac{1}{2} }](/tpl/images/0290/4507/0ec7b.png)
Final quantity of isotope after degradation
initial quantity of isotope
half life period of isotope
time period of degradation![4.6 = [\frac{ln\frac{N}{N_{0} } }{-0.693} ]* 1.25\\ln\frac{N}{N_{0}} = 2.550\\\frac{N}{N_{0}} = 12.81\\](/tpl/images/0290/4507/e5bac.png)
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Apotassium isotope has a half-life of 1.25 billion years. given that scientists estimate earth's age...
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