Question

Tritium, has a half-life of 12.26 years. A 5.00 mL sample of tritiated water has an activity of cpm. How many years will it take for the activity to fall to cpm?

A

6.13

B

12.26

C

24.52

D

36.78

Hard
Solution
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Correct option is D)

As we know,
Activity is
  

   
     
   

     

So it has completed three half time





So after 36.78 years, sample have activity of 

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