1.Starting with a sample of pure 2964Cu^{64}_{29}\text{Cu}2964Cu, 7/87/87/8 of it decays into Zn\text{Zn}Zn in 15 min15\,\text{min}15min. The corresponding half-life isa.10 min10\,\text{min}10minb.15 min15\,\text{min}15minc.5 min5\,\text{min}5mind.712 min7\tfrac{1}{2}\,\text{min}721minLogin to continueOnly logged in users canattempt or see the solution.
