Multiple Choice
If we start with 1.000 g of strontium-90,0.805 g will remain after 9.00 yr.This means that the 
of strontium-90 is ________ yr.
A) 7.74
B) 11.2
C) 28.8
D) 7.25
E) 41.6
Correct Answer:
Verified
Correct Answer:
Verified
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