# NEET Physics Nuclei Questions Solved

A mixture consists of two radioactive materials ${A}_{1}$ and ${A}_{2}$ with half lives of 20 s and 10 s respectively.Initially the mixture has 40g of ${A}_{1}$ and 160g of ${A}_{2}$. The amount of the two in the mixture will become equal after

(a)60 s                                      (b)80 s

(c)20 s                                      (d) 40 s

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