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The half life of a radioactive element is 8-days. How long it take to reduce it from 10 mg to 5 mg?

A4 days

B12 days

C16 days

D8 days

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Answer and explanation

Correct Answer: D: 8 days

Explanation: The correct answer is D: 8 days. If the half-life of a radioactive element is 8 days, it takes exactly 8 days to reduce from 10 mg to 5 mg. The half-life is the time for half the radioactive atoms to decay.

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