Approximately How Many Radioactive Atoms Are Present in a Tritium

question 33

Multiple Choice

Approximately how many radioactive atoms are present in a tritium sample with an activity of 0.4 x 10^-6 Ci and a half-life of 12.3 years? (1 Ci = 3.7 x 10¹⁰ decays/s)

• A)1.3 x 10⁸
• B)7 x 10⁸
• C)3 x 10¹⁰
• D)8 x 10¹²

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