Below Radioactivity quiz are Multiple Choice Questions (MCQs) type Quiz. These Radioactivity MCQ Questions helps you to refresh your Radioactivity, you can see the correct option by clicking on it. .
1. The half-life of a radioisotope is 2400 years. The activity of a sample is 720 counts /s.How long will it take for the activity to fall to 90 counts /s?
19 200 years
2. A detector is used to measure the count-rate near a radioactive source. The reading is 4000counts per minute. After 30 minutes the count-rate has fallen to 500 counts per minute.What is the half-life of the radioactive source? You may ignore the effects of backgroundradiation.