A freshly prepared sample of curium-243 undergoes 3312 disintegrations per second.After 6.00 y. ,the activity of the sample declines to 2755 disintegrations per second.The 
Of 
Is ________ y.
A) 4.99
B) 32.6
C) 7.21
D) 0.765
E) 22.6
Correct Answer:
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