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Q.

Tritium, 1H3 has a half-life of 12.26 yr. A 5.00 mL sample of tritiated water has an activity of 2.40 × 109 cpm. How many years will it take for the activity to fall to3.00 × 108 cpm?

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a

6.13

b

12.16

c

24.52

d

36.78

answer is D.

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Detailed Solution

C=Co12y3.00×108=2.40×10912y12y=18=123∴ y=3 or tt50=3∴ T=3×t50=36.78yr
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