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Q.

Samples of two radioactive nuclides, X and Y, each have equal activity Ao at time t = 0. X has a half life of 24 years and Y a half life of 16 years. The samples are mixed together. What will be the total activity of the mixture at t = 48 years?

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a

12A0

b

14A0

c

316A0

d

38A0

answer is D.

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Detailed Solution

1Tmix= 1T1+1T2effective half life time 24×1640=9.6 In 48 years no of half life is 489.6=5  initial activity is 2A0 after five half life time 2A05
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