# Problem: The half-life of Sr-90 is 28.1 years. How long will it take a 10.0-g sample of Sr-90 to decompose to 0.10 g? a) 80. years b) 140 years c) 190 years d) 2800 years

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The half-life of Sr-90 is 28.1 years. How long will it take a 10.0-g sample of Sr-90 to decompose to 0.10 g?

a) 80. years

b) 140 years

c) 190 years

d) 2800 years

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Based on our data, we think this problem is relevant for Professor Zellmer's class at OSU.