If the radioactivity of thorium C decreases to one-half in 1 h,in another 60 min its activity,compared with that at the beginning of the first hour,will be
A)1/4
B)zero
C)1/8
D)1/16
E)1/120

Question

Quizplus · Accepted Answer

The radioactivity of thorium C decreases to one-half in 1 hour. After another hour (making it 2 hours in total), it would decrease to half of one-half, which is one-quarter (1/4) of the original activity.

If the Radioactivity of Thorium C Decreases to One-Half in 1