NEET Physics Nuclei Questions Solved

NEET - 2012

A mixture consists of two radioactive materials A1 and A2 with half lives of 20 s and 10 s respectively.Initially the mixture has 40g of A1 and 160g of A2. The amount of the two in the mixture will become equal after

(a)60 s                                      (b)80 s

(c)20 s                                      (d) 40 s

For 40 g amount 

40ghalf-life20 s20g20s10g

For 160g amount

160g10s80g10s40g

      10s20g10s10g

So, after 40s A1and A2 remains same.

Difficulty Level:

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  • 44%
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