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The nuclide .^131 I is radioactive, with...

The nuclide `.^131 I` is radioactive, with a half-life of `8.04` days. At noon on January `1`, the activity of a certain sample is `60089`. The activity at noon on January `24` will be

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The correct Answer is:
A little morethan 75 Bq (elapsed time is little less than three half lives)
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