A radioactive nucleus can decay by two different processes. Half-life for the first process is 3...

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A radioactive nucleus can decay by two different processes. Half-life for the first process is 3.0 hours while it is 4.5 hours for the second process. The effective half- life of the nucleus will be:
(a) 3.75 hours
(c) 0.26 hours
(b) 0.56 hours
(d) 1.80 hours
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