Question

At time t = 0, N₁ nuclei of decay constant λ₁ and N₂ nuclei of decay constant λ₂ are mixed. The decay rate of mixture is
(a) $-N_{1}N_{2}e^{-(\lambda_{1}+\lambda_{2})t}$
(b) $-\bigg \lgroup\frac{N_{1}}{N_{2}}\bigg \rgroup e^{-(\lambda_{1}+\lambda_{2})t}$
(c) $-(N_{1}\lambda_{1}e^{-\lambda_{1}t}+{N_{1}\lambda_{2}e^{-\lambda_{2}t})$
(d) [tex]-N_{1}\lambda_{1}{N_{2}\lambda_{2}e^{(-\lambda_{1}+\lambda_{2})t}[/t

Answer 1

$<b>$

Option B is correct

Answer 2

Heya mate!!

Option (A) is correct.