Physics, 09.12.2019 20:31 Alysssssssssssa
Asap the half-life of cobalt-60 is 5 years. how old is a sample of cobalt-60 if only one-eighth of the original sample is still cobalt-60?
a. 5 years
b. 10 years
c. 15 years
d.20 years
Answers: 1
= 5 years
![ln[N]=ln[N_o]-\lambda t](/tpl/images/0410/4447/d724e.png)
![\log[\frac{[N_o]}{8}]=\log[N_o]-\frac{\lambda t}{2.303}](/tpl/images/0410/4447/db7f8.png)
![\log[\frac{1}{8}]=-\frac{0.1386 year^{-1}\times t}{2.303}](/tpl/images/0410/4447/6c1fa.png)
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Asap the half-life of cobalt-60 is 5 years. how old is a sample of cobalt-60 if only one-eighth of t...
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