Tritium, 31H has a half-life of 12.26 years. 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 to 3.00×108 cpm?
6.13
36.78
12.26
24.52
A
6.13
B
12.26
C
36.78
D
24.52
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Solution
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As we know, Activity is C=C0(12)y
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