Starting with pure ⁶⁶Cu, 7/8 of the sample decays into Zn in 15 min. Find the half-life.
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Starting with pure ⁶⁶Cu, 7/8 of the sample decays into Zn in 15 min. Find the half-life.

G1 Physics · Accepted Answer

If 7/8 decays, 1/8 remains. Since 1/8 = (1/2)³, 15 min equals 3 half-lives. Therefore T½ = 15/3 = 5 min. Correct answer: C.