Atomic bomb explosion
Sr-90 may be produced from an atomic bomb explosion. The half-life of Sr-90 is 28.8 years. What fraction of the Sr-90 originally produced by the first atomic bomb in July 1945 still remains as of July 2012?
a) 0.102
b) 0.209
c) 0.443
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Book-Revising Prose, 5th Ed. Please read the second chapter of Revising Prose and answer the questions below.
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