The half life of `I""^(131)` is 8 day. Given a sample of `I""^(131)` at t=0, we can assert thata)No nucleus will decay at t=4dayb)No nucleus will decay before t=8dayc)All nucleus will decay before t=16dayd)A given nucleus may decay beforeA. no nucleus will decay before `t = `4 daysB. no nucleus will decay before `t = 8` daysC. all nuclei will decay before `t = 16` daysD. a given nucleus may decay at any time after `t = 0`

The half life of `I""^(131)` is 8 day. Given a sample of `I""^(131)` a

1.	The half life of `I""^(131)` is 8 day. Given a sample of `I""^(131)` at t=0, we can assert thata)No nucleus will decay at t=4dayb)No nucleus will decay before t=8dayc)All nucleus will decay before t=16dayd)A given nucleus may decay beforeA. no nucleus will decay before `t = `4 daysB. no nucleus will decay before `t = 8` daysC. all nuclei will decay before `t = 16` daysD. a given nucleus may decay at any time after `t = 0`
Answer» Correct Answer - D Number of nuclei decreases experientially `N=N_(0)e^(-lambdat)` and Rate of decay `(-(dN)/(dt))=lambdaN` Therefore, decay process lasts upto `t=oo`. Therefore a given nucleus may decay at any time after `t=0`.

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