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OpenStudy (anonymous):
If a radioisotope has a half life of 10 years, how much of the original material would remain after 40 years?
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OpenStudy (ujjwal):
\[N=N _{0}e ^{-\lambda T _{1/2}}\] where N is number of atoms remaining N0 is initial number of atoms lambda is disintegration constant T1/2 is half life Also,\[\lambda=0.693/T _{1/2}\]
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