robert7248
31.07.2019 •
Mathematics
The decay rate for a radioactive isotope is 9.29.2 percent per year. find the half-life of the isotope. round to the nearest tenth of a year.
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Ответ:
F = P(1 - r)^t
0.5 = 1(1 - 0.092)^t
0.5 = (0.908)^t
log 0.5 = log (0.908)^t
log 0.5 = t * log 0.908
t = (log 0.5)/(log 0.908)
t = 7.18
7.2 years
Ответ:
69Step-by-step explanation:yoyegfhgdfhfdghdfg