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A sample of radioactive material decays ...

A sample of radioactive material decays simultaneouly by two processes A and B with half-lives `(1)/(2)` and `(1)/(4)h`, respectively. For the first half hour it decays with the process A, next one hour with the proecess B, and for further half an hour with both A and B. If, origianlly, there were `N_0` nuceli, find the number of nuclei after 2 h of such decay.

A

`N_0/(2)^8`

B

`N_0/(2)^4`

C

`N_0/(2)^6`

D

`N_0/(2)^5`

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The correct Answer is:
A
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