The activity of a radioactive sample is measured as 
counts per minute at 
and 
count per minute at 
. The time (in minute) at which the activity reduces to half its value is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
Fraction remains after 
half-lives,
Taking 
on both sides, we get
Now, let 
be the time after which the activity reduces to half
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