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# Two radioactive substances A and B have decay constants 5λ and λ respectively. At t=0, they have the same number of nuclei. The ratio of number of nuclei of A to that of B will be (1/e)2 after a time interval of1λ12λ13λ14λ

A
14λ
B
1λ
C
12λ
D
13λ
Solution
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#### We know that: N=N0e−λtFor A: NA=N0e−5λtFor B: NB=N0e−λt

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