The average life of a radioactive elemen...

The average life of a radioactive element is 7.2 min. Calculate the time travel (in min) between the stages of 33.33% and 66.66% decay

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The correct Answer is:

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`t""_(1)-t""_(2)=2.303/lamdalog"N""_(2)/N""_(1)`
`=2.303/0.138.log66.66/33.33(lamda=0.693/7.2)`

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