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The half - life of I ^ (131) is 8 days. ...

The half - life of` `I ^ (131)` is 8 days. Given a sample of `I^(131)` at time `t = 0` , we can assert that

A

no nucleus will decay before `t=4days`

B

no nucleus will decay before` t=8days

C

all nucleus will decay before` t=16days`

D

a given nucleus may decay at any tiem after `t=0` .

Text Solution

Verified by Experts

The correct Answer is:
d
Number of nuclei decreases exponentially,
`N=N_(0) e^(-lambda t)`
Rate of decay, `-(dN)/(dt)=lambda N`
Therefore, decay process lasts upto `t=infty`. Therefore, a given nucleus may decay at any time after `t=0`.
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