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Approximately How Many Radioactive Atoms Are Present in a Tritium

Question 6

Multiple Choice

Approximately how many radioactive atoms are present in a tritium sample with an activity of 0.6 × 10−6 Ci and a half-life of 12.3 years? (1 Ci = 3.7 × 1010 decays/s)


A) 4 × 1010
B) 2 × 108
C) 7 × 108
D) 1 × 1013

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