NEET Physics Nuclei Questions Solved


The half life of I131 is 8 days. Given a sample of I131 at time t = 0, we can assert that 
(a) No nucleus will decay before t = 4 days
(b) No nucleus will decay before t = 8 days
(c) All nuclei will decay before t = 16 days
(d) A given nucleus may decay at any time after t = 0

(d) Number of nuclei decreases exponentially
N=N0e-λt  and Rate of decay -dNdt=λN
Therefore, decay process losts up to t = .
Therefore, a given nucleus may decay at any time after t = 0.

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