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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