An isotope has decay constant

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

Problem

0.693\,\text{day}^{-1}

. If

10\,\text{g}

of the isotope is present initially, what percentage of the original mass remains after

2\,\text{days}

? (a)

50\%

(b)

25\%

(c)

38\%

(d)

12.5\%