NEET Physics Nuclei Questions Solved

Two radioactive substances A and B have decay constants $5\lambda$ and $\lambda$ 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 ${\left(\frac{1}{e}\right)}^{2}$ after a time interval

(a) $\frac{1}{4\lambda }$                                          (b) $4\lambda$

(c) $2\lambda$                                            (d) $\frac{1}{2\lambda }$

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