How much cu64 would remain from a 2mg sample after 12 hours?

Answer 1

To determine how much Cu-64 would remain after 12 hours, we need to know its half-life, which is approximately 12.7 hours. After 12 hours, the amount remaining can be calculated using the formula ( N = N_0 \times (0.5)^{t/T_{1/2}} ), where ( N_0 ) is the initial amount, ( t ) is the time elapsed, and ( T_{1/2} ) is the half-life. Since 12 hours is just below one half-life, approximately 75% of the original 2 mg would remain, resulting in about 1.5 mg of Cu-64 after 12 hours.