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Questions  

The half life of 131I is 8 days, given a sample of 131I 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

detailed solution

Correct option is D

Nuclear decay is a random process.

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