Half life of a radioactive substance 'A' is 4 days. The probability that a nucleus will decay in two half lives is:
A
B
C
D
1
Text Solution
Verified by ExpertsThe correct answer is:
B
After two half lives 
th fraction of nuclei will remain undecayed. Or, 
th fraction will decay. Hence, the probability that a nucleus decays in two half lives is 
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