1.

The radioisotpe, tritum (._(1)^(3)H) has a half-life of 12.3 years. If the initial amount of tritium is 32 mg, how many milligrams of it would remain after 49.2 years

Answer»

8 mg
1 mg
2 mg
4 mg

Solution :`N_(t) = N_(0) ((1)/(2))^(n) = 32 xx ((1)/(2))^(49.2//12.3)= 32 xx ((1)/(2))^(4) = 2`


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