Starting with a sample of pure `.^(66)Cu, 7//8` of it decays into `Zn` in `15` minute. The corresponding half-life is:A. `10` minuteB. `15` minuteC. `5` minuteD. `7(1)/(2)`minute

Starting with a sample of pure `.^(66)Cu, 7//8` of it decays into `Zn`

1.	Starting with a sample of pure `.^(66)Cu, 7//8` of it decays into `Zn` in `15` minute. The corresponding half-life is:A. `10` minuteB. `15` minuteC. `5` minuteD. `7(1)/(2)`minute
Answer» Correct Answer - C `N=N_(0)(1-e^(-lambdat))` `rArr (N_(0)-N)/(N_(0))=e^(-lambdat)` `:. (1)/(8)=e^(-lambdat)` `rArr 8=e^(lambdat t)" "rArr 3 ln 2=lambda t " "rArr=(3xx0.693)/(15)` `t_(1//2)=(0.693)/(3xx0.693)xx15" "t_(1//2)=5 min`

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Starting with a sample of pure `.^(66)Cu, 7//8` of it decays into `Zn` in `15` minute. The corresponding half-life is:A. `10` minuteB. `15` minuteC. `5` minuteD. `7(1)/(2)`minute

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