A mixture consists of two radioactive materials 
and 
with half lives of 20 
and 10 
respectively. Initially the mixture has 40 
of 
and 160 
of 
. The amount ofthe two in the mixture will become equal after
A
60 
B
80 
C
20 
D
40 
Text Solution
Verified by ExpertsThe correct answer is:
D
Let after 
amount of the 
and 
will become equal in the mixture.
As 
where 
is the number of half‐lives
For 
For 
According to question, 
or 
or 
or 
or 
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