Radioactive decay by two simultaneous processes (effective half-life)

1. A.
   None of the above
2. B.
   $T_{1/2} = T_{1/2}^{(a)} + T_{1/2}^{(b)}$
3. C.
   $T_{1/2} = \frac{T_{1/2}^{(a)}\,T_{1/2}^{(b)}}{T_{1/2}^{(a)} + T_{1/2}^{(b)}}$
4. D.
   $T_{1/2} = \frac{T_{1/2}^{(a)} + T_{1/2}^{(b)}}{T_{1/2}^{(a)} - T_{1/2}^{(b)}}$

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1. A.
   $\left( \frac{\ln2}{\ln3},\frac{1400}{3} \right)$ years
2. B.
   $\frac{\ln3}{\ln2}(1400)$ years
3. C.
   $\frac{\ln3}{\ln2}\frac{1400}{3}$ years
4. D.
   $\frac{\ln3}{\ln2}(700)$ years

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1. A.
   3.75 hours
2. B.
   0.56 hours
3. C.
   0.26 hours
4. D.
   1.80 hours

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