Radioactive Decay: A radioactive substance containing 4.0 × 1016 unstable atoms has a half-life of 2.0 days. What is its activity (in curies, Ci) after 1.0 day? (1 Ci = 3.70 × 1010 Bq)
Fill in the blank(s) with the appropriate word(s).
4.3 Ci
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