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JEEMAIN and NEET
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2007
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Q)
Two radioactive substances A and B have decay constants
5
λ
and
λ
respectively. At
t
=
0
they have the same number of nuclei. The ratio of number of nuclei of A to those of B will be
(
1
e
)
2
after a time interval :-
( A )
1
2
λ
( B )
4
λ
( C )
2
λ
( D )
1
4
λ
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