A pure sample of a radioactive isotope is allowed to decay for a time equal to two…

CHEMISTRY · Single correct · US High School · Chemistry · Atomic Structure & Nuclear · Atomic Structure & Nuclear

Problem

A pure sample of a radioactive isotope is allowed to decay for a time equal to two half-lives. Which fraction of the original nuclei has NOT yet decayed? (a) 12\dfrac{1}{2} (b) 14\dfrac{1}{4} (c) 18\dfrac{1}{8} (d) 34\dfrac{3}{4}

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