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What part of an original isotope's numberof atoms remains have two half-lifes?
Wiki User
∙ 12y ago
After two half-lives, 25% of an isotopes original number of atoms remains.
AT = A0 2 (-T/H)
Where A0 is the original activity, AT is the activity after some time T, and H is the half-life in units of T, so ...
A2 = A0 2 (-2/1)
A2 = 0.25 A0
Wiki User
∙ 12y ago
Wiki User
∙ 14y agosomeone need's to answer this question so i can do my HOMEWORK?
Wiki User
∙ 14y agoAfter two half-lives, 25% of the original material will remain.
Wiki User
∙ 7y agoAfter one half-life the number of atoms is 50 %.
Wiki User
∙ 8y ago25 % of the isotope remain.
Wiki User
∙ 8y agoone quarter
Riley Nelson
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