Question

HELPPPPP ......................

Answer 1

in 2 half lives it becomes 1/4 times
so 100/4 = 25

Answer 2

$oh \: wow \: i \: am \: telling \: you \: formula \: of \: radioactive... \: then \: u \: solve \: the \: question....$

Radioactive Half-Life Formula. A radioactive half-life refers to the amount of time it takes for half of the original isotope to decay. For example, if the half-life of a 50.0 gram sample is 3 years, then in 3 years only 25 grams would remain.


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