Multiple Choice
If we start with 1.000 g of cobalt-60, 0.400 g will remain after 7.00 yr. This means that the half-life of cobalt-60 is ________ yr.
A) 12.1
B) 17.5
C) 2.80
D) 5.30
E) 7.65
Correct Answer:
Verified
Correct Answer:
Verified
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