Question

Starting with a sample of pure ⁶⁶Cu, $\frac{7}{8}$ of it decays into Zn in 15 min. The corresponding half-life is-

• A. 5 min
• B. 7$\frac{1}{2}$ min
• C. 10 min
• D. 15 min

Answer 1

Answer: (A)

5 min

Answer 2

D.P =$\frac { 7 } { 8 }$, A.P = $\frac { 1 } { 8 }$ = (n = 3)

* T_1/2 = $\frac { \mathrm { t } } { \mathrm { n } }$=$\frac { 15 } { 3 }$= 5 min