How Many Atoms Decay in 12 Hours in a 3

Multiple Choice

How many atoms decay in 12 hours in a 3.5 × 10−⁸ Ci source? (1 Ci = 3.700 × 10¹⁰ atom/s)

A) 4.1 × 10−¹⁴ atoms
B) 1.6 × 10⁴ atoms
C) 5.0 × 10⁴ atoms
D) 5.6 × 10⁷ atoms
E) 4.6 × 10²² atoms