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Define 'half life' , 'decay constant and...

Define 'half life' , 'decay constant and 'mean life'of a radioactive element and write the relation connecting them.

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The correct Answer is:
c
`lambda = 0.3465 ("day")^(-1)`
As `N = N_(0)e^(-lambdat)`
`3/4 N_(0)/N_(0) = e^(-0.3465 t)`
`0.3465 xx t = log_(e) 4/3`
`t=2.303/0.3465[log_(10)4-log_(10)3] = 0.88` days.
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