If We Start with 1

Question 143

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 half-life of strontium-90 is ________ yr.

A) 7.74
B) 11.2
C) 28.8
D) 7.25
E) 41.6

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