and 
are the two radioactive elements. The mixture of these elements show a total activity of 1200 disintegrations/minute. The half life of is 1 day and that of
is 2 days. What will be the total activity after 4 days? Given: The initial number of atoms in
and
are equal.
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
Use activity , where
.
For the two elements:
Initial total activity:
After time days:
Now compute decay factors:
For
For
So,
Divide by initial:
Substitute:
Thus,
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