1.

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?

Answer»

1mg
2 mg
4 mg
8 mg

Solution :AMOUNT LEFT after N half lives
`=([A]_(0))/(2^(n))=(32)/(2^(4))=2MG`


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