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If 3.0 grams of strontium-90 in a rock sample remained in 1989 approximately how many grams of strontium-90 were present in the original rock example in 1933?
Wiki User
∙ 9y ago
From the fact that Strontium-90 has a half-life of approximately 28 years, the amount remaining in 1933 would be 3.0 x 2^2 = 12.0 g.
Wiki User
∙ 9y ago
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