The radioactivity of an old sample of a liquid due to tritium (half life \( 12.5 \) years) was f...

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The radioactivity of an old sample of a liquid due to tritium (half life \( 12.5 \) years) was found to be only about \( 3 \% \) of that measured in a recently purchased bottle marked ' 7 year old'. The sample must have been prepared about :
(A) 70 year
(B) 220 year
(C) 420 year
(D) 300 year
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