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A piece of a radioactive material contains 100 atoms. If its half-life is 20 seconds, ...

A piece of a radioactive material contains 100 atoms. If its half-life is 20 seconds, the time taking for 124 atoms to remain is _____________
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  • A 20 seconds
  • B 40 seconds
  • C 60 seconds
  • D 80 seconds
Correct Answer: Option C
Explanation:

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