# The radioactivity of a given sample of whisky due to tritium (half life 12.3 years) was found to be only 3 % of that measured in a recently purcha

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The radioactivity of a given sample of whisky due to tritium (half life 12.3 years) was found to be only 3 % of that measured in a recently purchased bottle marked '7 years old'. The sample must have been prepared about.
A. 220 years back
B. 300 years back
C. 400 years back
D. 70 years back

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