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A piece of radioactive material contains 1000 atoms…

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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

QUICK ANSWER…

C

DETAILS…

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:

  1. Option A is incorrect.
  2. Option B is incorrect.
  3. C is correct.
  4. D is not the correct answer.
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KEY-POINTS…

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
A piece of radioactive material contains 1000 atoms... » QuizTablet

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