A freshly prepared sample of curium-243 undergoes 3312 disintegrations per second. After 8.00 yr, the activity of the sample declines to 2591 disintegrations per second. The half-life of curium-243 is 
A) 6.26
B) 32.6
C) 10.2
D) 1.36
E) 22.6
Correct Answer:
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