If the activity of a radioactive sample falls to 25 % of its initial value

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

Problem

If the activity of a radioactive sample falls to 25\% of its initial value, the elapsed time is equal to (a)

3\,T_{1/2}

(b)

2\,T_{1/2}

(c)

0.25\,T_{1/2}

(d)

0.42\,T_{1/2}