Starting with a sample of pure 66 Cu , 7/8
of it decays into  Zn in 15 minutes. The correspondin half life is
[20051
(a) '15 minutes
(b) 7minutes
(c)10 minutes
(d) 5 minutes

Answers (1)

N_{t} = N_{0} (1/2)^{t/t_{half }}

after 15 min

\frac{1}{8} N_{0}= N_{0} (1/2)^{15/t_{half }}\Rightarrow \frac{1}{8} =(1/2)^{15/t_{half }}\Rightarrow {15/t_{half }} = 3 \Rightarrow t_{half }= 5 min

 

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