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Suppose 40% of a Radioactive Substance Remains After 2 Years

Question 10

Multiple Choice

Suppose 40% of a radioactive substance remains after 2 years.Assume that ln 0.4 = -0.9 and find the decay constant.

A) 0.225
B) 0.45
C) 0.6
D) 1.8
E) 3.6

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