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)

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Quizplus · Accepted Answer

The number of atoms can be calculated using the formula N = (Activity x Half-life) / (0.693 x Decay constant). Converting the activity to decays per second and using the half-life, the calculation yields approximately 8 x 10^12 atoms.

Approximately How Many Radioactive Atoms Are Present in a Tritium