Two radioactive materials A and B have decay constant 4λ and λ respectively. If initially both have the same number of atoms, then the ratio of the number of atoms of A and B will be 1 : e after a time:
1
\(\frac{e}{\lambda}\)
2
λ
3
\(\frac{1}{3\lambda}\)
4
\(\frac{1}{4\lambda}\)