The radio isotope, tritium (""(1)^(3)H) ...

The radio isotope, tritium `(""_(1)^(3)H)` has a half life period of 12-3 years. If the initial amount of tritium is 32 mg, how many milligrams of it would remain after 49-2 years?

1mg

2 mg

4 mg

8 mg

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The correct Answer is:

Amount left after n half lives
`=([A]_(0))/(2^(n))=(32)/(2^(4))=2mg`

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