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A radioactive nucleus can decay by two d...

A radioactive nucleus can decay by two different processes. The mean value period for the process is `Z_(1)` and that for the second process is `Z_(2)`. The effective mean value period for the two processes is:

A

`(Z_(1) + Z_(2))/(2)`

B

`Z_(1) + Z_(2)`

C

`sqrt(Z_(1)Z_(2))`

D

`(Z_(1)Z_(2))/(Z_(1) + Z_(2))`

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The correct Answer is:
d
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