A piece of radioactive material contains 1000 atmos. If its half -life is 20seconds, the time taken for 125 atoms to remain is
- 20 seconds
- 40 seconds
- 80 seconds
-
60 seconds
The correct answer is: D
Explanation
1000 → 500 → 250 → 12520 + 20 + 20 = 60s
There is an explanation video available .