A piece of radioactive material contains 1000 atoms. If its half-life is 20 seconds, the time taken for 125 atoms to remain is…
A. 20 seconds
B. 40 seconds
C. 60 seconds
D. 80 seconds
Let’s carefully perform the tracing manually, so as to avoid errors:
1000 atoms = 0 seconds
500 atoms = 20 seconds
250 atoms = 40 seconds
125 atoms = 60 seconds
Now for the right answer to the above question:
- Option A is incorrect.
- Option B is incorrect.
- C is correct.
- D is not the correct answer.
You may please note these/this:
- Please take note and realize that the material will always decay to half its former value after every additional 20 seconds.
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/ culled from 2017 JAMB-UTME physics question 4 /
A piece of radioactive material contains 1000 atoms... » QuizTablet
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