The initial activity of a cobalt-60 sample was 1200 dpm and dropped to 75 dpm after 21.2 years.What is the half-life of this radionuclide?
A) 4.24 years
B) 5.30 years
C) 7.07 years
D) 10.6 years
E) 21.2 years
Correct Answer:
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