If the activity of a sample of ²³²Th decreases from 1000 cpm to 500 cpm in 60 min, in another 60 min its activity will be A) 500 cpm. B) 0 cpm. C) 250 cpm. D) 125 cpm.

Question

Quizplus · Accepted Answer

The activity of the sample halves every 60 minutes due to radioactive decay. Since it decreased from 1000 cpm to 500 cpm in the first 60 minutes, it will halve again to 250 cpm in the next 60 minutes.

If the Activity of a Sample of 232Th Decreases from 1000

If the Activity of a Sample of ²³²Th Decreases from 1000