If a radioactive isotope that was injected into your bloodstream has a half life

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If a radioactive isotope that was injected into your bloodstream has a half life

If a radioactive isotope that was injected into your bloodstream has a half life of 5 hours, how many hours do you have to wait before the amount of this isotope in your body is its original amount?
A) 20
B) 25
C) 5
D) 10
E) 15

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padre

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killian Author

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10 years ago

Thanks sir

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