# SOLUTION: A 6.3 gram sample of an isotope of strotium- 90 was formed in a 1962 explosion of an atomic bomb. The half- life of strontium- 90 is 28 years. In what year will only .07 grams re

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 Click here to see ALL problems on Miscellaneous Word Problems Question 282972: A 6.3 gram sample of an isotope of strotium- 90 was formed in a 1962 explosion of an atomic bomb. The half- life of strontium- 90 is 28 years. In what year will only .07 grams remain?Answer by scott8148(6628)   (Show Source): You can put this solution on YOUR website!.07 = 6.3 (1 / 2)^((x - 1962) / 28) log(.07 / 6.3) = ((x - 1962) / 28)[log(1 / 2)] {[log(.07 / 6.3)] / [log(1 / 2)]} * 28 = x - 1962 [{[log(.07 / 6.3)] / [log(1 / 2)]} * 28] + 1962 = x