A radioactive sample has mean life

CHEMISTRY · Single correct · CBSE · Chemistry · Chemical Kinetics · Chemical Kinetics

Problem

15\,\text{h}

. For safe disposal its activity must fall to

2.0\%

of its initial value. Approximately how long, in hours, should the sample be stored before disposal? (a)

84.6

(b)

25.5

(c)

59

(d)

121.7