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What does the physical half-life of a pure sample of radioactive material refer to?

waelhammad
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2022-10-21
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What does the physical half-life of a pure sample of radioactive material refer to?

  1. the amount of time taken for half of the radioactive atoms to decay.
  2. half of the time that it would take for all of the radioactive atoms to decay.
  3. the average time taken for any particular radioactive atom to decay.
  4. the time it takes for half of a sample of ingested radioisotope to be cleared from the body
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waelhammad
2022-10-21
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A: The half-life of a particular radionuclide is the time it takes for half of the remaining atoms of that particular radionuclide to decay. Choice B is not the same thing.

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