A radioactive nucleus can decay by two d...

A radioactive nucleus can decay by two different processes. The half lives of the first and second decay processes are `5 xx 10^(3)` and `10^(5)` years respectively. Then the effective half -life of the nucleus is

`105 xx 10^(5)` years

4762 years

`10^(4)` years

47.6 yrs

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