Starting with a sample of pure ⁶⁶Cu, 7/8 of it decays into Zn in 15 minutes.The corresponding half-life is: A)3.75 minutes B)5 minutes C)7 minutes D)10 minutes E)15 minutes

Question

Quizplus · Accepted Answer

The decay of 7/8 of the sample means that only 1/8 remains, which corresponds to three half-lives (since (1/2)^3 = 1/8). Therefore, the half-life is 15 minutes divided by 3, which is 5 minutes.

Starting with a Sample of Pure 66Cu, 7/8 of It

Starting with a Sample of Pure ⁶⁶Cu, 7/8 of It