1.

Fraction of the element decayed during its mean life will be:

Answer»

e
`N_(0) LOG e`
`(log e)/(N)`
`1-1/e`

Solution :`TAU=1/lambda THEREFORE tau lambda=1`
Now, `N=N_(0)e^(-lambdat)""rArr N=N_(0)e^(-lambdat)`
`N=N_(0)e^(-1) =(N_(0))/e therefore tau =1/lambda`
`N/(N_(0))=1/e`
So fractional of ELEMENT decayed is `=1-1/e`


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