4 days
12 days
16 days
8 days
The half-life of a radioactive element is the time required for half of the radioactive atoms to decay. Given that the half-life is 8 days, and we need to reduce the amount from 10 mg to 5 mg (which is half of 10 mg), it will take exactly one half-life.
Also check the solution of this question: The half-life of Carbon- 14 is 5730 years. Determine the time it takes for 100 mg of carbon- 14 to decay to 6.25 mg?
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