A freshly prepared sample of curium-243 undergoes 3312 disintegrations per second.After 10.0 yr,the activity of the sample declines to 2437 disintegrations per second.The half-life of curium-243 is ________ yr.
A) 7.36
B) 32.6
C) 13.6
D) 2.13
E) 22.6
Correct Answer:
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