Tritium Is Radioactive with a Half-Life of 12

Multiple Choice

Tritium is radioactive with a half-life of 12.33 years decaying into ³He with low-energy electron emission.If we have a sample of 1.91 × 10¹⁸ tritium atoms,what is its activity in decays/second? (1 year = 3.15 × 10⁷ s)

A) 4.92E+9 decays/second
B) 3.41E+9 decays/second
C) 1.07E+17 decays/second
D) 6.69E+16 decays/second
E) ​3.41E+10 decays/second