Question:
The radioactivity of an old sample of a liquid due to
Last updated: 6/11/2023
![The radioactivity of an old sample of a liquid due to](https://media.kunduz.com/media/sug-question-candidate/20210726173058519719-2333357.jpg?h=512)
The radioactivity of an old sample of a liquid due to tritium half life 12 5 years was found to be or about 3 of that measured in a recently purchased bottle marked 7 year old The sample must ha been prepared about D 300 year A 70 year B 220 year C 420 year